I think changing the text color of the thread titles back to black was a huge improvement over the new blue. The only other color/layout thing that should be changed is that it is now nearly impossible to the see the line separating the content of a posting from the user's signature. As for a technical issue, I see that the handy list of smilies/emoticons are gone, which may irritate some people if they are used to clicking on them rather than typing them.

Other than that, I'm not seeing any real issue with being able to use the forums, but then I rarely deal with private messages and have never done anything with the blog features here.

Keep the faith.