Shameless self promotion but I am the AM for
www.thisisvegas.com using
www.400affiliates.com. The software is
www.rivalpowered.com and another good Rival is Slotocash.
As for a software breakdown and programs I would recommend:
Microgaming:
32red [#1 IMO]
Intertops [#2 IMO]
CasinoRewards
Brightshare
Bellerock
Referback
Playtech:
Bet365
Mansion
Europartners
BetFred
VegasTechnology:
CasinoCoins
RTG
Inetbet
ClubWorld
Slotland
Slotland (use their own software)
I highly recommend the following site which rates the programs along with terms and conditions for the affiliates. By terms I mean showing which programs are ethical and don't have predatory terms to take advantage of the affiliate (you).
http://www.affiliateguarddog.com/forums/
Hope that helps.
John