I tried to sign up for the $150 TouchPad developer deal a few days before they stopped accepting submissions, but they never even responded.
I signed up, and was later told that they were out of devices, but later I got one (last one according to them).
I see that the ebay.com's site the $149 one is still for sale (the one I got).
I was able to cross-compile and run luajit on it, and creatonix (Tim Caswell) got even more stuff (but haven't tried it yet).
It looks like there is a whole "homebrew" society distributing lots of open source packages. It's called Preware.