I still prefer linksmanager.com the best.
The best for google SEO is, of course, to have no link pages (google SEO), and to link naturally. But, we’re in the gambling industry, and unless your site is several years old (the older the better), you’ll need to exchange links the old fashioned way to get anywhere.
Yahoo and MSN still love a lot of links. Google practically ignores them – unless they come from authority sites in your niche. Those are worth their weight in gold. Good luck getting those for a new site.
Also, if you want to exchange links with good sites, it’s best to leave the automated emails in the trash bin – cuz that’s where they’ll end up at the other end, anyway.