Some of the tools may not have classroom applications
Thinkfinity: Thousands of free lesson plans and resources!
Web 2.0 for the Classroom Teacher: A LONG list of online tools for teachers.
Better Lesson: This is a bit like Facebook for teachers. There are some outstanding lesson plans and resources posted here. Need to register (free).
Classroom 2.0: A site for teachers interested in brining 2.0 tools into their instruction.
Moving at the Speed of Creativity: Wes Fryer is a front-running educator and speaker. His page has lots of resources and information.
Go2Web: Hundreds of online tools and applications. This is like the Walmart of Web 2.0 tools sites.