tedster - 4:35 am on Feb 28, 2010 (gmt 0)
Interesting observation, batto.
So in the usual Adwords position, instead of ads you saw links to related Google searches -- searches that happen to have commercial results. In other words, those "related" links themselves aren't ads at all except for the fact that Adwords might be present on the SERP you get if you do click.
Google tests a lot of things - sounds like a rather complex one.