On Kuht.it you'll find KuhtForge that's a Sourceforge port to E-Xoops php/mysql portal.
It will be interesting if someone will try to port this code (or the idea..) to Tiki
I think that a sourceforge-like approach could be a different *view* of actual tikiwiki tools. Some of the tools you find on sourceforge are also on tiki: news, forums, trackers - bugs, support, patches, feature requests - tasks, docs (wiki), surveys, files and soon.
The architecture is different. Sourceforge is a project-based site, so the tools are assigned to single projects. Do you think it will be possible to assume this kind of architecture for tiki as a possible option, without modifying the code so much?
Perhaps categories will be the "projects", but I think we need to have an user interface to submit projects, as is on sourceforge. isnt it?