I'm looking forward to Leopard's Time Machine, but Versomatic - at least based on the description - is going to truly rock my world. It's not the first app to offer this kind of versioning and archiving, but it sounds better than those that have come before.
Versomatic is a new utility from Acertant which runs as a background service, tracking changes to your files over time. It needs no additional hardware and is a great complement to your existing backup strategy. Once installed it tracks changes, and preemptively archives a copy of a file you're about to edit prior to your modifying the file. You can tell it which file types to track and which to ignore - or set it to ignore entire directories if you wish. Files are stored in their native format and you can specify how much hard drive space is available for version stores and how many revisions to keep track of. Prior revisions are accessible from a contextual menu or from the Version Manager in your menubar. The edit trail and export features can also be used to prove authorship, copyright, and as part of any complete Sarbanes-Oxley and HIPPA compliance strategy, which many Enterprise users will appreciate.
I just tried the newly available Version 1.0 for Mac and the install and initial preference setting was a breeze, despite requiring me to restart. I tested it out on a few Word docs and text files and it works as advertised so far. Of course only time will tell how well it really works and whether it affects performance in any way, but so far I like what I see.
Versomatic can be download now and has a 30-day free trial. Early Birds can purchase it for $39.99 (20% off the regular price) and volume discounts are available. It's Universal Binary, but does require Mac OS X 10.4 or newer. Take it for a spin and let us know what you think of it!