One blog that I regularly read is Cool Cat teacher, which is by Vicki Davis, a middle school teacher from Georgia, USA. She also has a podcast which is great way to pick up on new ways of using web 2.0 tools in the classroom. Inspired by her example I decide it was time to update my wikispace on teaching EFL/ESL with technology.
Check out her latest one which is an introduction to all these wonderful ways of using the internet in our teaching practice. If you're not using PowerGrade then I'd skip the first 18 minutes and go straight to her presentation on learning with podcasts, blogs and wikis.