If you're just looking to manage your personal environment, probably Vagrant + Chef. If we're talking about for a team or organization, a former co-worker of m

If you're just looking to manage your personal environment, probably Vagrant + Chef. If we're talking about for a team or organization, a former co-worker of mine wrote a nifty tool called Boxen [http://boxen.github.com http://boxen.github.com] that's definitely worth checking out.