Well i have started making Reviews Mod for vB 4.x. (already written 800 lines of code). My mod has its own section and category like vBCms has. (i have not integrated with forums like other have done in past).
Category and Sections (backened) pages are done, today will be doing custom fields part.
http://awesomescreenshot.com/0585hxu9e
Will release two version of this mod (Free here and Pro on My site)