It's amazing to watch the increasing habitability of newly discovered extra-solar planets. Remember a few years ago when a super jovian was an exciting discovery? Sure it was an easy assumption: planets ought to be common, if our system had 9 (yes back before poor pluto was demoted). The spector of the anthropic principle was always there though. Now, to see the discoveries mount - as fast and earthlike as our instruments are capable? That's exciting. Hell, 20 light-years? That's not so far away from the planned orion interstellar trip.