#19.Discover any site from the Web2.0 awards list New internet technologies and web-sites that are empowering users with the ability to create and share content.

http://www.seomoz.org/web2.0/short

I chose to explore http://www.biblio.com/
It's book search engine....similar with Amazon.com....where you can find books by author ,title....or if you want to buy used books you can buy them for 2 dolars.