Obviously the idea for 2 columns of tabs came from the large area of unused space.
See A and B.
Russ: On your styles, consider the 2 column approach to save space ... especially on sites that use XenMediaGallery which will add a third tab. Tabs are likely to expand IMO ... so having 4 thin hard to click tabs on top of each other will start to get silly.
The current low height tabs are awkward to click on.
Russ: The large print New Posts text is also redundant. To maximize space consider getting rid of that text.