Update 7 June 2004: I won't be adding any more features to this Mod before phpBB v2.2 is released. I will, however, be developing a version of it for 2.2 and providing an upgrade path for users of the current version. For info / discussion see here
Have just finished this mod and would be grateful for a few 'early adopters' to give me some feedback before I submit it to the mods database.
Download it here
Users rate individual posts to produce overall ranks for posts, topics and users. Highly-configurable admin system, allows rank labels and graphics, negative voting, rate on first post only, ranks based on totals or averages, see who rated (+ allow anonymity). Designed to minimise performance impact on viewtopic and viewforum screens
You can get a feel for how it works by looking at my live ratings page (note the rating scheme I've chosen for my live site is different to the default one in the download)