Passport to Web 2.0

http://www.cellphonesinlearning.com/
A conversation about integrating student cell phones into classroom curricula.

http://www.ustream.tv/
LIVE, INTERACTIVE BROADCASTING
Experience live video. In just minutes, you can broadcast and chat online with a global audience. Completely free, all it takes is a camera and Internet connection.

http://www.polleverywhere.com/
Poll Everywhere replaces expensive proprietary audience response hardware with standard web technology. It’s the easiest way to gather live responses in any venue: conferences, presentations, classrooms, radio, tv, print — anywhere. It can help you to raise money by letting people pledge via text messaging. Its simplicity and flexibility are earning rave reviews.
Poll Everywhere [...]

http://www.wordle.net/
Wordle is a toy for generating “word clouds” from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text. You can tweak your clouds with different fonts, layouts, and color schemes. The images you create with Wordle are yours to use however you like. You can [...]

http://www.e-tutor.com/et2/graphing/
Advanced web-based graphing calculator allowing students to enter one or more equations and view them with position/intersection indicators and zooming functionality.  Enter functions of x using a standard mathematical format. You can enter more than one function by separating functions with a semicolon.

http://www.zamzar.com/
It allows you to convert documents, images, videos and music files and share them with friends.