I've lost another article I swear I knew I would remember where it was. I'm sure it was in that SEO newsletter most of us are subscribed to, but I looked in the archives and couldn't find it.
Anyway, it was about adding a search box to your website and studying what people are looking for. There was a link for a free services that allows you to put one of those boxes on your site, and stupid me didn't bookmark it at the time.
The resources is really all I need, but the article would be good too.
Thanks everyone!