To start, thanks so much for your work on this product. It really fills the "last mile" of my continuous integration process, not an easy feat. I've now got a really smooth commit->build->package->deploy setup using Deployment Manager 2.0, Github and TeamCity.
One thing that I've always wanted to improve on though is rolling-back from a production release that has some fatal flaw (I can't write a test to save my life). Since DM2, by default, switches a site to a new folder for each release (cool idea) rolling back to an earlier build would be really fast/easy if I could just point the site at an earlier folder. Is that something that might be supported? I know with more complicated deployments (i.e. database changes) that wouldn't really work but for simpler sites it would be pretty great.