I asked this same question a few days ago.
I have found one that wasn't mentioned which seemed pretty good.
http://www.adultlegal.com
They have lots of dvds you can license - I'm thinking of getting one myself - I'm just worried whether it makes it through Customs (I'm in England)
The only other one that I've found that is worth a mention is
http://www.adultcontent.ca
They have downloadable movies but most of the content seems to be from BrunoB's site and its all over the web already
Blazin