I think the sitemap makes a difference only when a site is dynamic in nature and the session IDs were screwing up googlebot, otherwise it seems to be of little help.
Good catch! I didn't even bother checking the date of this post (even though I really should have since lot of new members here have been bumping old threads lately). All well, I suppose my post could still help someone.Your first post and you decide to bump a thread from 2010