Richard Byrne has created some great charts comparing EdTech tools over at his blog, .
He has charts comparing:
Alternatives to Google Image SearchHead on over and take a look. These are very useful when trying to find and select a tool to use.
Backchannel and informal assessment tools
Building classroom websites
Building classroom blogs
Creating multimedia textbooks
Creating multimedia quizzes
Audio editing tools
Multimedia timeline tools
Mind-mapping tools
Mobile video creation apps