iMechanica: 9000 registered users, 30,000,000+ web hits
The number of registered users of iMechanica reached 9000 on 13 October 2008, after two years and one month since the website launch. The total number of posts is 4036, the total number of comments is 8888, and the total web hits is estimated to be more than 30,000,000.
Hosted at Harvard School of Engineering and Applied Science and maintained by a growing number of volunteers, iMechanica aims