Google Trends was another interesting tool. I didn't immediately see how I would use it in my classroom, but it's one of those things I'll keep in Diigo and in the back of my mind. It could make for some data in a compare/contrast or persuasive essay.
On an unrelated tangent (which is kind of becoming the norm for me, lately), I've been trying this year to get my kids to Google more effectively. I teach them about identifying key words, and some simple Boolean logic, but it seems every time I turn my back, they just go right back to typing in questions in complete sentences. (The irony, of course, is that's the only time I can get them to write a complete sentence, it seems.) I tried the Google Game with one class, but a lot of them found it counter-intuitive- "Why would I want less information?" It's kind of a chore, but I think effective searching and analysis of website validity is something that will be more and more valuable in years to come. The tough part is that a lot of information on websites that don't pass the smell test is still true, and I don't want to entirely cut off message boards and other forms of information just because they are sometimes wrong. Unfortunately, with a movement towards short, quick projects instead of months-long research papers, it's difficult to show kids how to filter information effectively. As of right now, I have no good answer for this. /rant