Postbit looks nice and clean, the extras aren't grating at all.
I would install BoP5's Xenforo Breadcrumb, and definitely would get Ozzy's advanced footer, to really pimp this out some without adding any significant extra load. I have those on my site here for your viewing enjoyment.
Also you're not leveraging browser cache of static assets. This is a easy fix in .htaccess.
Overall, nicely done. Refreshing to see a vBulletin that isn't loaded down with 2 megabytes of heavy imaging. People can find and go to, what they're looking for. Uncluttered.
Nice job.
Thanks for the great review Max! I just have a couple questions. How did you find that 404 error, where did you click? Also I couldn't find BoP5's xenforo Breadcrumb plugin, could you link it? Thanks again!