For the curious geeks in the audience, Lift Off establishes a reverse SSH tunnel from our proxy servers to the local Apache server on your Mac. We then assign you a random http://vhx.me short URL that dynamically routes your users through our servers back to your Mac.
There's no reason a smart geek like you couldn't setup this sort of thing on your own, but we hope you'll like that we've already done the hard work to make it one-click simple :-)
VirtualHostX takes all the pain out of running multiple websites on your Mac. My only wish is that I had started using it sooner.