Google Knol!

The site,knol.google.com,is the rival to Wikipedia and was recently launched by Google to compete head on. They use knol because they consider a knol to be a unit of knowledge written by and expert on the topic. It's a fun, free, user friendly site with lots of great information on lots of topics. I was surprised to know about this from the magazine Computer Malar, googled about this site and found it to be pretty useful! You have to definitely try it out!