has some of my favorite web 2.0 tools that I use every day at school. The most frequent tool on this website that I use is the name picker. (pictured above) This tool allows you to list words and then puts them into a slot machine and randomly spins and selects a "winner". I use this as part of my classroom management. I have students who I "catch" working hard or doing a nice job and have them type their name into the classtools list on my computer. They know the more they get their name in, if at all, the better chance they have to win an eagle egg. (PBIS recognition award at our school.) I have also used it to call on students randomly to answer questions, or make groups/partners.
There are a handful of additional tools on classtools.net as well that are super helpful. A few other ones I have used is a countdown timer that plays music, and fakebook- where you can make a fake Facebook profile page.