I am Admin of a WordPress blog and have upgraded to v. 2.3. I have tested what a "contributor" can do and encountered the following two problems:
1. When a contributor tries to post by pressing the button "submit for review", the post seems to go nowhere. As Admin I can't see it in order to moderate it!
2. A contributor selecting the "comments" tab can see all those comments which are awaiting moderation (even those submitted by others). That's not desirable.