The community library of user features is hosted at 
You can either locate and download particular revisions of files in the trunk branch through the web interface, or use a bazaar frontend to pull a local branch of the library from launchpad.net. You can then continue to work with the models in a version controlled manner. ()
With launchpad we keep the models in an accessible and collborationable infrastructure superior to wiki file attachments.
When you are working on your own models, Launchpad/bazzaar can also help you in managing/publishing your model sources for yourself/your group.
Join the "SeSAm trunk uploaders" team for write access to the sesam-featurelib development focus branch.