About a year ago I lost a battle with Citrix over whether I was allowed to place ads based on Citrix's trademarks. This issue specifically played out via Google's Adwords program and my training class.
To recap, I wanted to place ads with Google for my training class that appeared when someone typed the phrase "Citrix Training" into the search engine. I had these ads for awhile, but then Citrix contacted Google and asked Google to take down any ads that fired based on search terms that were Citrix trademarks. Citrix claimed that they were protecting their intellectual property, and that I was not authorized to unfairly use their trademarks for my gain.
Google cancelled the ads for my training class.
Today I learned via Slashdot that Geico sued Google over this same issue and lost, essentially setting precedent for other trademark owners. The judge in the case said "as a matter of law it is not trademark infringement to use trademarks as keywords to trigger advertising".
I immediately resubmitted my cancelled ads, and they are all live now. It looks like Google is now letting ads be triggered by any search term, regardless of the trademark owner.