Very nice integration job!
I have all 3 PhotoPost programs and like to display them in vBulletin like yours. I currently can only get PhotoPost to integrate into the forum, but I'd like the featured photos to display vertically on the right side of the forum. All 3 programs' categories to be listed below the forum's categories.
Is it very hard a thing to do ? How much customizations have you done in order to get your site working so beautifully like that ?