'...web framework that's optimized for programmer happiness...' says it all right there, doesn't it? You know what makes me a happy programmer? Building things, not mucking about with setting up a new dev environment (and filling my machine with crap) every time I hop on a new client project. Make the 'trivial' shit go away so I can focus on the fun/interesting/creative/productive stuff...sounds good to me. I'm very interested in a product like this where I can configure on the fly and keep my machine uncluttered. (seriously, it just feels gross to have 6 different versions of rails and 4 different rubies installed on my machine, even if RVM makes it kinda easy)