I'm not quite sure if this site qualifies as an official web2.0 site but I had to share. It's really a teacher tool that helps manage classroom discipline. It's called Class Dojo and it's really easy to set up and use. After signing up and entering your students into your class, you give each student a unique monster/alien avatar. Its purpose is to recognize positive behaviors such as participation and hard work as well as negative behaviors such as causing disruptions, no homework and being disrespectful by keeping a running total for each student. When you recognize a student for doing something positive you click on the student and choose the appropriate praise and it gives the student a point. It takes away a point for every negative behavior. There are many classroom uses that I can think of for a site like this. I'm sure people will criticize it though because it takes points away which is negative and we all know we shouldn't make a child feel bad for doing something inappropriate.... (argh) but I think it's cool and will likely try it anyways someday!