Hi!
I'm writing a vBulletin 3 gallery addon at the moment. When I've finished it and tested it on my live forums, I'll release it here at vb.org for free.
Slated feaures include:
+ Comment system
+ Ratings system (Maybe)
+ Gallery categories
+ Ability to list items by user, giving each member their own gallery
+ Each user can create a title and description for their gallery
+ Uses the existing forum system to organise gallery items and comments, making it very easy to moderate or set permissions......
Here's a screenshot of the alpha development to give you a taster (no control buttons yet, but that will come)...