Man, finding and colonizing another planet is the ultimate of ultimates for me. The most precious commodity humans have is land to live on. If we suddenly got an Earth-like planet to use...well, we could kiss Texas good-bye. They'd be on the first colony shuttle.
And yes, I realize the sheer science fiction of finding, let alone getting and colonizing a perfectly uninhabitable planet. Still, the possibilities are awesome to consider...
Agreed, sometimes I think I was born a little too early. I'm going to witness the first man on Mars probably. Or maybe a telescope view on a Earthlike habitable planet if I'm lucky. I can only dream about what will be discovered in the centuries after that.