Looks great!
The only thing I have doubts about is that the "Last Post" column takes the exact same width as the forum name and description. This, divided by the contrasting colors of the new posts/threads columns makes a great design
but... it also makes it look as if it is another forum. As if right now you had two on the left side, and two on the right side. Obviously with a little reading what it says you will realize it is not so, or just by experience, so its no big problem... It has that dissadvantage, but on the other side it makes it look really cool.
I like it, looks great