In reply to Rodolphe.

I've seen folder-based organization for media pop up a few times. I suppose it really depends on how you want that feature to work.

Would a faux folder feature work? Maybe by creating a new taxonomy -- let's call it "media folder" -- that allows users to group their media? If the only purpose is sorting via the admin, that could be a possibility. A taxonomy could give you all the benefits of sorting without any of the roadblocks of moving around the actual files.

Or, do you need something that physically allows sorting media into folders on the filesystem? I'm guessing that would be harder to accomplish since core would have to deal with hardcoded URLs in post content such as if a user moved an image. The same issue would exist with options, widgets, and many other places where an image URL may reside.

Or, do you want something that sorts into media-type folders? I could see that working out of the box.