Passport to Web 2.0

 
http://www.dimdim.com/
 
With no software to download or install, Dimdim forever democratizes web- based live meetings. In seconds – right from your browser – you easily host or attend web meetings complete with audio and video conferencing, screen and application sharing. After experiencing the freedom and ease of Dimdim Web Meetings, you’ll wonder why you ever used [...]

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

Musopen!

www.musopen.com
Musopen is an online music library of copyright free music (public domain music). We want to give the world access to music, without the legal hassles so common today. There is a great deal of music that has expired copyrights, but almost no recordings of this music is in the public domain. We aim to [...]

http://www.yourchildlearns.com/owlmouse.htm 
Help your child learn with games, software and educational activities from Owl & Mouse Educational Software.   Early reading software—phonics software, alphabet games, and Dolch sight words in a fairy tale story.  All of it FREE!  Free online USA maps, world maps, map of Europe, map puzzles of the US, Europe, Africa, Asia, and many more.  [...]

http://www.jogtheweb.com
Imagine you know all about ducks (or elephants, or anything in fact) and you have discovered a lot of cool information on the web you now want to share with all the other duck-addicts. The thing is that this information is spread out on plenty of different sites. You could of course put up [...]