http://www.commoncraft.com/twitter This is a video from YouTube "Twitter in Plain English".

http://www.c4lpt.co.uk/handbook/twitter.html This is a resource on how to use Twitter.

http://www.c4lpt.co.uk/socialmedia/twitterrl.html This is a reading list for Twitter.

http://twitteroid.com/blog/wp-content/files/TwitteroidsMasteringTwitter.V2.pdf This is a manual "Mastering Twitter in 10 Minutes or Less"

http://twitter4teachers.pbwiki.com/ This wiki was created to easily help educators find other educators on Twitter that have the same interests as them (that teach in the same content area).
http://steve-wheeler.blogspot.com/2009/01/teaching-with-twitter.html This blog talks about how to use Twitter in education.

http://twitter.com/BarackObama You can follow Obama on twitter to listen to his speeches.


http://theopenclassroom.blogspot.com/ This is a secondary English teachers blog with entries on uses of Twitter.

http://twiducate.com/ This is a version of Twitter for schools with a few more safety features.