Gearing Up for Friday Kickoff

I'm leading a 4 session training starting Friday over the next four weeks at school. Each week features a different theme (with a football theme twist). This week's session is called "Kickoff Fall with Web 2.0." I'm hoping to showcase at least 20 different Web 2.0 sites. This week I get to make a list of the key sites to feature and pray they aren't blocked at school. Wish me luck!