Cheshire most of us utilize the same basic formula.
1) We build portals targeted at specific player types IE General Casino, Slots, Blackjack, Bonus Seekers etc
2) We optimize these portals for the best possible search engine ranking for key search terms. The target engine is Google
3) We suplement regular search engine traffic with Pay Per Click lisitings.
4) We do email campaigns to past visitors which opted in to our newsletters
5) Some of us purchase banner ads or other times of online advertising.
Those are by far the most prevelant ways successful affiliates promote online casinos.