I've had Web & Software Development: A Legal Guide (ISBN 1413300871) from Nolo recommended as a good guide to at least get you up to speed enough to talk to a real lawyer. I've not gotten around to picking it up myself, but it has good reviews on Amazon and I've been satisfied with other Nolo published books (my wife used one on getting a small business started). They've also got online information at nolo.com.

But yeah, this is really a case where you want to listen to the people saying "IANAL" and talk to a real L.