Clean up the Classroom with Clorox® - classroom activities and tips for teachers
Blogs, Wikis, Doc: Which one is right for you? – great comparison of the three tools
Museum of Humor - lesson plans that are fun for both you and your students, free printable worksheets, puzzles and other cool stuff, and lots of information on using humor in the classroom.
Fablevision posters – free motivational posters
Gotofreebie – “GotoFreebie.com makes it easy to find and share the hottest freebies, free stuff and free samples. GotoFreebie offers useful and quality free samples and giveaways on everything from baby and healthcare products to games and music.”
Original image: 'The Toolbox is Organized!' http://www.flickr.com/photos/95248808@N00/178177044 by: Dan Thompson