I love Twitter! It took me awhile to start using it, but it is an exponential wealth of information via links to education articles, discussions, and Web 2.0 tools. I started following LiveBinders recently.
If you haven't explored LiveBinders before, it is a website that allows you to create an online binder that is similar to a physical binder. You can name your binder, add tabs and subtabs, and organize your resources into it. Resources can include webpages, videos, pdfs, and images. You can share your binder and/or look at binders that others have shared. I had originally set up an account with LiveBinders in my last graduate class hoping I would start using LiveBinders to store my units online as well as having my physical unit. But, if it is usable at school, it would be an AWESOME tool for students to create their own LiveBinder of learning for student-led conferences in the fall and spring!
LiveBinders posted a link to this binder about Web 2.0 that heyjudeonline created. It's a great place to start if you are unsure about how to teach students to search online. Another great binder for teachers is Web 2.0 Tools created by Mrs.B which tells about everything Web 2.0. If you just thought, "I'm not really sure what web 2.0 is OR I don't know what web 2.0 is," then you should definitely look into this binder!
I would also suggest going to CommonCraft if you are unsure about the latest in technology. This site contains short, 3 minute educational/informational videos created by Lee and Sachi LeFever using simple paper cut-outs and a "fun and light-hearted style". (You can also search "in Plain English" on YouTube to find the same videos.)