Don't forget the other specialty searches

[Brad]

Naturally enough SEO's tend to focus on business related topical search portals. But in your promotional B2C efforts don't forget the entertainment and hobby related vertical directories and search engines. Often they will give free listings to commercal sites in their niche or of interest to their niche visitors and you may be able to find a place for your listing(s) too. They can also be decent advertising platforms for small mom and pop businesses. A lot of both webmasters and searchers visit these type portals as a group each day which presents some unique marketing opportunities.

[Anthony Parsons]

True, though I wouldn't personally spend much time concentrating my efforts on them. The major influences with the specialty niches generally hone through quickly IMO. Like white on rice.

[seobook]

I think registering in directories (especially free or one time payment ones) is where the best money on the web is.

granted you can do mega ppc or rent tons of links, but if you dont have much money to spend directory registration is important.