FWIW, this question is asked here about once a week or so; I suggest looking through the previous posts, there's plenty of good information on this topic.

http://www.google.com/search?hl=en&q=site%3Anews.ycombin...

There's also some useful into on Quora:

http://www.quora.com/How-do-you-find-good-startup-partners-c...

http://www.quora.com/Finding-Co-Founders/Which-networking-al...