As a developer I'm used to Subversion for source control and I think it's great for sharing source code between developers.

Now thinking about my graphists and game designers, they need to have a slightly different approach I think.

1. They need to share binary files
2. They need to be able to have a thumbnail and preview of their work
3. I don't want to include their binaries into my game repository (would be much too heavy for developer when updating)

I've seen that some graphists uses personally created website to share their work but I was wondering if some "standard" application existed in order to provide my graphists a cool way of working together.

Is there a common way of dealing with this? Is the way I want to do (only final sprites on my game repo) correct? How do you guys do this as game developers?