Trademarks and Search Engine Marketing

If you're a trademark holder, you'll want to read this article, "Trademarks and SEM" (ClickZ Today). Kevin Lee lays out the potential issues associated with others bidding on your trademarked term and using trademarks in ad copy, and outlines Google's and Overture's trademark policy.
Related: "Effective Search Engine Optimization" - The basics of SEO to get you started.
Related: Trademarks and Trademark Registration - Information about trademarks and trademark registration in Canada.