The brightness doesn't bother me, overall kind of like the style. Just one observation regarding the "mark forums read", "watch thread", "recent posts" type links that are up near the top right between the announcement banner and the forums, posts, thread, etc.. being viewed. They are light enough against the green background that they really blend in. Someone who didn't know that they were there to look for them might never even see them.
(they're selected in the screen cap to highlight them...normally they blend in way more without the bluish highlighting)
(they're selected in the screen cap to highlight them...normally they blend in way more without the bluish highlighting)