This might be somewhat off topic since you are looking for another technical co-founder to build a product as opposed to someone to help build a company.

At the risk of being presumptuous, I like to offer my latest chapter on how to build a team, not so much on how to entice talents but to screen the wannabes who do not have the staying power to be in a startup.

http://www.lovemytool.com/blog/2008/03/team-building.html

Good luck. It sounds like fun.