Excuse my rhetorics, but I'd like to present LogiLogi Manta to you.
LogiLogi Manta is a FOSS Rails-app that aims at making insightfull philosophical-and humanities-related discussions possible over the web, where quality of content and open-ness are the core values.
Manta can be quickly described as wiki + tagging + rating, where rating is from the viewpoints of different peer-groups, and multiple documents can be competing for the same tag(s)...
Manta will be presented in a lightningtalk at the Fosdem 2007 in Brussels (FOSDEM | Free and Open Source Software Developers' European Meeting).
You're welcome to join us for the World LogiLogi Day in #logilogi on freenode.net, or to have a browse on our pre-alpha: http://www.logilogi.org:3000/
greetings,
Wybo Wiersma