Thanks for the heads up, kwblue.
Affiliate links with SEO’d title tags are counterproductive to the affiliate. Affiliate links with title tags only serve to help the casino rank higher in the serps, which can interfere with your own SEO efforts. The best thing to do is to NOT use title tags with your affiliate links — just delete them and use only the “href” portion of the link.
Alternately, you could add rel=”nofollow” to the link code, to prevent Google from passing PR to the link. I believe rel=”nofollow” is only a Google thing; I’m not sure if Yahoo or MSN pay any attention to it.