re: buying ads- We've experimented with google ads and stumbleupon so far (no print yet) and while we've seen plenty of traffic, there is a high educational component associated with our stuff for ads to be truly effective at this point (ie. visitor has to know the value of open source, be using virtualization, etc).
The good news is people who like JumpBox _love_ it because it removes so much pain. So the word is spreading, just not as fast as we'd like. We're evaluating the best way to "light the strategic fires" to accelerate adoption. Thanks for the advice.
sean