Hi Sillyputty. The http://rideshare.burningman.com
link would be good if it were updated to 2011, but it isn't yet.
I have noticed that some folks in the Share Resources forum are discussing rideshares there since they do not have a better spot yet. However, this forum is not for commerce, so I am hesitant to recommend it (with regards to reposting):viewforum.php?f=78
But hey, check out zpublisher's post at the bottom of this thread:viewtopic.php?f=78&t=38180
He could be your man! He leaves from LA. Good luck.