Two small issues I have with the new theme:
1. On my computer, the whole page doesn't fit on my screen anymore, so I have a sidebar at the bottom. It's a little annoying. (I'm running IE 7 at 1024x768 res)
2. The contrast between the grey background and the purple words makes them hard to read. Those colors seem very similar to one another.
Besides those two things, I like the new theme. I really liked the old one, but the brightness doesn't bug me too much and the menus look sleeker.