Great chart with written explanation of the chart on the sides

Great site full of 2.0 tools to use in the classroom

http://whatis.techtarget.com/definition/Web-20-or-Web-2
Shares the history of Web 2.0 and helps to understand it's origin.

http://www.web2teachingtools.com/
This site is a collection of sites and an understanding of the sites listed to use in the classroom

IXL is the Web's most comprehensive K-12 practice site. Widely used by schools and families, IXL provides unlimited practice in more than 3,500 math and English topics. An adaptive learning system features games and awards, inspiring students to achieve.