Gateway / Doorway pages are often mentioned by SEO experts as not working however, this truely isnt the case, so long as you keep them relevant to the site you are building.

A good example of this in action is the current articles section on GWW we actually get a fair amount of traffic from the articles in the search engines due to them being specific to a certain aspect of the adult industry, in fact, some of the articles themselves have #1 listing for a variety of search terms.

Regards,

Lee