Just a real small issue and hardly worth mentioning, but I have some time, so I will!
I'd like to see some better color contrast on the thread pages where we post.
Everything seems to run together. It would be more readable and more attractive IMHO if there were a better way to demarcate all the areas, like different background colors or darker lines. For instance, the quote bubble used when quoting somebody could be darker in color so it contrasts better against the lighter color of your post. Also, the left handed area where our user names go has little separating it from the post area. There could also be a better way to separate one post from the next.
The "Board Index" page on the other hand is very nice, very readable and easy on the eyes because it has nice color contrast, with dark colors separating parts of the page from lighter ones and the darker font color makes for an easy read. So maybe modeling the rest of the site on the Board Index page would be the way to go?
All-in-all though, this is a great site!