I have a bunch of business cards of affiliate networks, however, your best bet is to go straight to the source. You will hit the motherload of these networks if you attend Ad-Tech. They have yearly conventions in LA, San Fran, NYC, London etc etc. VERY big. I went to the San Fran one last year..
For the shortest route if you dont want to travel, although I suggest you go, is to visit
http://ad-tech.com/ and see who the vendors are. That should give you the namesof these affiliate networks. just go, it's fun.