i've installed miniBB forum software on my avatars website and i am very impressed with the look and feel of it.
the 500kb package is tiny, taking up hardly any room as first installed. i look forward to tweaking the styles to suit my own site. the upgrades i have installed are the 'avatars package' and the 'first page news'...soon to install the 'move replies' and 'file uploads' but one step at a time.
check out my forum and while you're there, you can request some custom made avatars for your own miniBB forum (if you have installed the avatars package).