1. San Francisco parking meter prepaid cards. Save those quarters for laundry! That's right, every parking meter with one of those diagonal slots will take this thing and your prepaid money.
2. Move over, Google Earth! NASA's got something meatier! I was searching around for open source maps, and I found NASA's own 3d global satellite data flyaround thing called World Wind. But in addition to earth, it also has Moon, Mars, Venus, Jupiter and Sloan Digital Sky Survey.
This is a picture of one of the moon landing sites.