The Legal Moves podcast discusses considerations for design partnerships:

http://www.strebecklaw.com/legal-moves-episode-2-partner-up-or-go-solo-part-1-with-jeremy-commandeur-and-brian-henk/

http://www.strebecklaw.com/legal-moves-episode-03-partner-up-or-go-solo-part-2-with-jeremy-commandeur-and-brian-henk/

http://www.strebecklaw.com/legal-moves-episode-05-partner-up-or-go-solo-part-3-with-jeremy-commandeur-and-brian-henk/