Use: http://www.teamups.net/ to collaborate with other game developers. You can also use it to find other people like marketing and design etc. It's a skill funding platform. It just started and still in beta but its quite usable already and free to use. Don't be scared by the lower quality game projects that are curently on the service. You can always create a new team up that asks for better skilled people.

The quality of the project attracts the the same kind of quality skilled and experienced people.

Take your advantage of teaming up with other game developers and built better quality games! If there are any questions I'm willing to answer them. Also if you have feedback please don't hold back, but remember that there is still a lot of development going on.