Poll LinkDoomRL Forum uses a quite simple forum script, namely minibb. There are a few reasons I chose minibb instead of a more "feature packed" forum software. The main one is that te forum needs to be lightweight, especialy in terms of database size -- I've got a fixed limit of 20MB on the forum database. Second reason is that I wanted to keep control over the features. And third - it needed to be easy skinnable.
All three reasons are still valid, but I am conscious that minibb lacks a few features, most notably it lacks any kind of "unread messages" system. Taking some time to look at the source made me conscious that a "unread messages" system would be a pin in the ass to code, and would take some time (which could be spent on development instead).
OTOH, if I'd install a new forum, then skinning it so it is doomish might be a problem, especialy if the interface is complex :-/.
Hence I give you the above poll. Bare in mind the problems I noted when voting.