Hey,
I receive most of my visitors from traffic exchanges. Im just a newbie to these casino affiliate programs but I think I have done pretty good so far.
I would say http://www.trafficswarm.com, http://www.clickthru.com and http://www.webmasterquest.com have been the best for me so far.
Overall I think traffic exchanges are pretty good but you have to get a hell of a lot of visitors to see any results, I find anyways.