The Source Filmmaker, the free filmmaking tool that Valve uses for its shorts, trailers and tv commercials, has added support for Steam Workshop. Now you can share your models with other filmmakers, rate the work of others, or pick out just the right music for your film. The SFM Workshop is going to be a fully peer-to-peer workshop, allowing you to upload and download assets easily. That does, however, mean that the approval process will solely be determined by the votes (and flags) of folks browsing the workshop. Still, the normal rules apply - don't publish other people's work or anything that others would consider offensive.
Models and sounds will be the first asset types the SFM Workshop supports. We chose models because model sharing has been one of the most-requested features to date, and we wanted to ensure that the filmmaking community has a single destination for all models compatible with the SFM. Similarly, we chose sounds because the SFM community has made it clear that including dialog would allow filmmakers even greater flexibility in their storytelling. Also, the SFM team can assure you that the first time we hear a solid impression of Dr. Kleiner singing Baby Got Back, we at Valve will all collectively lose it.
So go see what's in the workshop! We've put up info on the wiki to walk you through it. Also, be sure to check out the discussion forum, where you might find like-minded collaborators eager to help create the models and sounds for your opus!