We run FolderShare in our company despite my pleas to switch to a document management service. Mostly because it does the file syncing automatically. But it doesn't support *nix and Mac is secondary. I've tried a few but sadly FS is still "the best" out there.
But I just read about this:
http://www.nuxinov.com/And I have high hopes that it might solve my file sync needs within our company and get me one step closer to a Windows free environment. Then I just need to ditch my Visio and my iPhone (unless I can sync with Songbird or iTunes decides to ever support Linux which I doubt, BASTARDS).