Jill Whalen has written an interesting article on search engine optimization in ISEDB.com
(Internet Search Engine Database) at:
Jill Whalen stresses the importance of keyword research as the basis to your site's architecture. So what methods of research should you use? Read the article to for some good tips. There is a link to Wordtracker but that is a fee not free service; nevertheless, it's interesting to pay a visit to http://www.wordtracker.com/ to see the scrolling ticker of a day's top words:
Happy search engine optimizationThe Wordtracker Ticker
Shows the top 50 search terms for various search engine voyeurs and metacrawlers for the past 24 hours. This information is updated daily.