I wouldn't be doing my job if I didn't recommend..

Not a book and not a blog, but if you want to keep up with the latest JavaScript stuff on a weekly basis through e-mail: <a href="http://javascriptweekly.com/" rel="nofollow">http://javascriptweekly.com/</a> - It's mine but it's had kudos from folks like Steve Souders and Amy Hoy and almost at 3000 subscribers so I don't feel too bad pimping it ;-) If you want a preview, the <a href="http://javascriptweekly.com/archive/5.html" rel="nofollow">latest issue can be seen on the Web.</a>

And yes, this post is going in today's edition for sure :-)