Over the years, I've read or been recommended a number of books which are essential reading for professional web developers. I've compiled the list of books below to help the community find a comprehensive list of good books that can help them be better coders. 

<h3>JavaScript</h3>

<a href="http://www.amazon.com/gp/product/047022780X?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=047022780X">Professional JavaScript for Web Developers</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=047022780X" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0596101996?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0596101996">JavaScript: The Definitive Guide</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0596101996" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1590595335?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1590595335">DOM Scripting: Web Design with JavaScript and the Document Object Model</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1590595335" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1590598563?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1590598563">AdvancED DOM Scripting: Dynamic Web Design Techniques</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1590598563" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1590596803?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1590596803">Beginning JavaScript with DOM Scripting and Ajax: From Novice to Professional</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1590596803" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1847194141?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1847194141">Object-Oriented JavaScript: Create scalable, reusable high-quality JavaScript applications and libraries</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1847194141" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0596517742?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0596517742">JavaScript: The Good Parts</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0596517742" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />


<a href="http://www.amazon.com/gp/product/1847196705?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1847196705">Learning jQuery 1.3</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1847196705" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1590597273?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1590597273">Pro JavaScript Techniques</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1590597273" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/193398869X?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=193398869X">Secrets of the JavaScript Ninja</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=193398869X" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0321423305?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0321423305">ppk on JavaScript, 1/e</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0321423305" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1590597648?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1590597648">Accelerated DOM Scripting with Ajax, APIs, and Libraries</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1590597648" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0321491939?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0321491939">Ajax Security</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0321491939" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0596159773?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0596159773">jQuery Cookbook: Solutions & Examples for jQuery Developers (Animal Guide)</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0596159773" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/1935182323?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1935182323">jQuery in Action, Second Edition</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1935182323" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://jqueryenlightenment.com/">jQuery Enlightenment</a> 

<h2>HTML & CSS</h2>

<a href="http://www.amazon.com/gp/product/1430219203?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1430219203">Web Standards Solutions: The Markup and Style Handbook, Special Edition</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1430219203" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0321509021?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0321509021">Bulletproof Web Design: Improving flexibility and protecting against worst-case scenarios with XHTML and CSS (2nd Edition)</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0321509021" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.sitepoint.com/books/cssdesign1/?SID=82b54f50488243b44b6b9c7acb10731a">The Art & Science Of CSS</a>

<a href="http://www.sitepoint.com/books/css2/?SID=82b54f50488243b44b6b9c7acb10731a">HTML Utopia: Designing Without Tables Using CSS, 2nd Edition</a>

<a href="http://www.amazon.com/gp/product/1600330045?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1600330045">Head First HTML with CSS & XHTML</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=1600330045" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0321687299?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0321687299">Introducing HTML5 (Voices That Matter)</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0321687299" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://books.alistapart.com/product/html5-for-web-designers">HTML5 For Web Designers</a>

<h2>Site Performance</h2>

<a href="http://www.amazon.com/gp/product/0596529309?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0596529309">High Performance Web Sites: Essential Knowledge for Front-End Engineers</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0596529309" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/0596522304?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0596522304">Even Faster Web Sites: Performance Best Practices for Web Developers</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=0596522304" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

<a href="http://www.amazon.com/gp/product/059680279X?ie=UTF8&tag=rebasbl-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=059680279X">High Performance JavaScript (Build Faster Web Application Interfaces)</a><img src="http://www.assoc-amazon.com/e/ir?t=rebasbl-20&l=as2&o=1&a=059680279X" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />

This is certainly not all inclusive and I'm sure there are other books out there that have been great. If you feel very passionate about a specific title, let me know via the comments and I'll check it out.