Rebuild the Party - http://www.rebuildtheparty.com/
I highly recommend this site, which was previously featured on CentreGOP.org's "Featured Activism" section and gained national prominence during the RNC Chairman's race. The organizers of this site are serious about making the GOP the party of conservative values again, but also demonstrate an understanding that "you can govern if you can't win." I really dig their balance of message and strategy and hope many other folks from this group will as well!
We Surround Them USA
(not to be confused with the 9-12 Project's official website, which is the same address, but with a ".com" instead of ".us.")
We Surround Them Pennsylvania