A site for downloading and submitting content for SGDK2 has been launched at
http://sgdk2.enigmadream.com/. Hosted here will be finished games, game source code, and template files with importable content, all search-able, sortable and rateable thanks to Joomla and ReMOSitory.
I'm not sure if this is ready for prime time, but if you have content you'd like to submit, give it a try. Let's see how it works.