tedster - 2:45 am on Jun 27, 2010 (gmt 0)
Things have moved on from 2006, Mr. Witch. The very same Mr. Cutts confirmed at PubCon Austin that googlebot is submitting forms -- and even establishing "virtual links" in their webgraph to handle PR flow to URLs they discovered this way.
Other members here have also noticed various googlebot "form submission" gets in their logs, - even with keywords being input to a textbox that were selected from around their website. And sometimes apparent nonsense or even security tests, too.