A service like this should really be integrated into every desktop "shell" and configurable for various storage back-ends like FTP, WebDAV or Subversion.<p>Every desktop I work at has a link to an FTP folder on my site where I keep various shared data. I also have ~/svn folder where I keep data I need versioning for (not code). I wouldn't pay anyone money for what I already have but I <i>would</i> acquire DropBox if I were Apple or Microsoft and integrated it into Explorer/Finder.