These forums use the Spanish Translation and some extra language tweaks i added on my own ...
the plugins i use are:
Allow Images
Avatar Upload
BB-Emoticons
BB-Ratings
BB-Signature
Front Page Topics
Indicate New Posts
Page Links for bbPress
Post Count
Private Message
Quicktags 4 bbPress
Quote
Simple Online List
And a Custom BB-Badge Plug-in i made :)
The skin is an edit of the original bbpress theme, i made it to fit the main site (a Wordpress blog). The icons are from the Tango Project.
The most noticeable changes in the layout are on the forum displays (front page and the one for each forum) and the profile.
:)