Newsletters - Web Designer Depot, CSS Weekly, Web Design Weekly, HTML5 Weekly, Responsive Design Weekly, JavaScript Weekly, Smashing Magazine. 

Also, many resources listed at http://movethewebforward.org/ 

Also, the feeds listed on Paul Irish's site at http://www.paulirish.com/2011/web-browser-frontend-and-standards-feeds-to-follow/

Finally, about 100 twitter users.