We have a site that has been covnerted to PHP, and I just noticed Google is getting this when it tries to index the dynamic pages:
cookies=off?cookies=off was not found on this server.

It looks like the session appendage is causing the problem- I have read that turning off session.use_trans_sid and turning on session.use_only_cookies will help...is there a downside to doing this? Can anyone clarify what exactly is happening?