There appears to be something wrong with the site search, results mostly don't include titles and the brief snippets. E.g. Searching for "Google" brings back results like: "Untitled
http://openacs.org/forums/message-view?message_id=53769". Perhaps this is due to Google's visit and the subsequent load on the machine?
The cvs repository suggests that there isn't a robots.txt for OpenACS.org in CVS. I plan to exclude Google from attempting to post messages and log-on on my site using robots.txt (by barring robots from /forum/message-post and /register). I'm sure a few of us would be interested in any subsequent alterations to the robots.txt to exclude various dynamic parts of the site from Google's gaze.
For those unaware, Google is doing a "deep crawl".