I don't think the design of the forum is anything special. Afterall, it's default mixed with a couple of custom images which only feels a little inconsistent. The layout however is very clean and well organized.
The Logo text appears jaggy around the edges and doesn't compliment the style at all.
Like I said, top marks on the layout and feature placements though everything else (design wise) is your default vbulletin style with a few custom icons thrown in.