I read an article on http://www.wahmbuds.com/blog/  about joint ventures and it is very informative if you have considered doing one.  The article is here:

http://wahmbuds.com/blog/resources/teaming-up-with-other-wahms-on-joint-ventures/#more-19

It is worth a read for more info before you commit to someone.  I am doing a joint venture with 2 different people right now and it can be scary.  Protecting your work and money comes first!

Chris