Very comprehensive article with an extensive bibliography. Allow some time to thoroughly digest it. More needs to be shared about the joys of working with middle schoolers
if you need to bookmark a site and want to have a copy of your bookmarked sites accessible from any computer- it's free and very easy to use. LiveBinders is like having a 3-ring binder for the Web- collect your resources, organize them easily, present them to your students/colleagues. Your students can access them from the laptops simply by going to the site and searching for your public binder by name, or by logging in with your information. You can make your binders private or public. There are hundreds already made that you may be able to use in your classroom (someone else has already done the work for you) - if it is public you can make a copy of it and save the binder in your account!
AASL's list of the best websites to use with students. Be sure to check out the other years as well, including landmark websites, sort of a "Hall of Fame".
Proof that there is a twitter chat for just about everything. I focus so much on education issues that I sometimes forget the broad scope of twitter (beyond education and celebreties)