There are a number of affiliate networks relating to online casinos and internet gambling. The best affiliate programs should provide you with the following:

* Free sign up to join the affiliate program
* Banners and marketing tools to help promote their online casinos
* Generally 20%-50% of the profits of players you lead
* Easily accessible customer service
* Traffic analysis and earnings/payment information
* The better networks have multi-tiered affiliate programs

In my opinion, Euro Partners and Fortune Affiliates are great for those new to affiliate programs. They provide a wide range of marketing tools and banners to help you promote their casinos.