This is a little slide show that I did up to show how search engines work and how you can do your own keyword research.
Pay particular attention to slide 6 - it's got all the links to "the good stuff".
This will help you research the popularity of specific search terms so you can use them for domain names, url structures and keywords in articles and titles.
- http://strataxl.com/blogs/internet_marketing/2008/8/13/how-search-engines-work-or-keyword-research-101/252