Rand Simberg of privatizing space travel:

The Key to the Universe

We are presently constrained to this planet not because no one wants to go to Mars -- the Mars Society puts the lie to that notion. Simply put, it's because the people who want to go can't afford to, and the people who can afford to have no (or at least insufficient) desire to spend their money in that manner. While this will probably strike people as obvious, it's useful to state it nonetheless, because it then provides guidance to potential solutions.

There are two.

Personally I think it would look real cool to see the fuel tank of a space shuttle all decked out in Coca Cola colors. "Thing's go better with Coke...."