I absolutely love the new forum. It is balls out the bestest thing you ever did. I did like the old forum but this will be so much easier for you to manage.
It is working great.
Couple small tweaks: The banner header is slightly off - try saving it as a gif and forcing the background to be "cccccc". Ralph's Tachi will still look OK and the background will blend (something a jpg won't do). It is OK to save small photos as gifs, really.
The designer in me wishes you used more expressive type and a more subtle drop shadow in the title text too.
And I would pick even softer colors for the various blue bars and headers - with the idea of the black text being the strongest element on the page (easier to read).