another to watch (out) for is perhaps more mainstream companies getting into the adult industry:
i.e.
www.HUSHDVD.com just launched under-the-radar. It's a division of Columbia House but they're trying to keep it "hush hush". time will tell how big a threat it is.
(more in this thread)
http://www.gofuckyourself.com/showthread.php?t=414097