I do realize this is a nice little treasure-trove of patent Q&As, but so far it's the only IP-related Q&A site on SE. I see there are proposals in Area 51 for a Copyrights Q&A site and an Open source licensing Q&A site, but I'm skeptical that they will ever make it out of beta, if even that far.
I think that a more general "IP Law" Q&A site covering patents, trademarks, copyrights, and licensing would make for a well-rounded, yet still fairly specific and topical Q&A site.