The best way to get listed on ANY search engine is a combination of backlinks and submitting.
Use the sitemap generator on
Firewall Test, Web Tools and Free Internet Security Audit. Once you have the xml/txt sitemap of your site, submit it to google's webmaster account, yahoo link submission, and to MSN. The sitemap basically gives the index the links to your board without actually having to spider.
And backlinks is easy. Find similar sites and exchange links or post something in their forums or guestbooks which your link in it. Once that site is spidered again, and as long as they aren't enforcing the rel="nofollow" attribute, the spider will follow the link to your site and you're sorted.
But, then again, getting listed is only 1/2 the problem... The next problem is getting your link above the 6billion other sites in front of you!