TimeDrawer is a nifty little versioning application which automatically archives different versions of your files. The application itself is well built and the interface is just gorgeous and quite intuitive. It also has a version comparison function which allow you to view the revisions which were made in between versions. This is indispensable for people who work with documents a lot. Sure it's a far cry from Time Machine which comes with Leopard. But this will do for now. Read the full review at TUAW. The application is free for download at MacUpdate.