We can roll all these posts into one. The good folks at Samizdata remind me to follow my beliefs all the way through: I want private fuel-cell cars and infrastructure to fuel them -- of course, the answer is private space travel:
If our civilisation is to make the leap from a one-planet to a multi-planet one, then, just as when it made the leap from a European to a global civilisation, the ultimate drivers will not be government programmes (of Prince Henry the Navigator, Ferdinand and Isabella, Kennedy and Khrushchev). Progress will rather depend upon commercial enterprises which serve public demand (the East India company, the Cunard line, the embryonic space tourist companies).