First read about this at Robert Scoble’s blog yesterday. Paul has done a phenomenal job of combining the power of Google Maps and Craigslist.

Google maps is on one extreme of sophistication and Craigslist is on
one extreme of simplicity. Paul is brilliant in combining the
sophistication and simplicity to display how this combination can take
usability to the next level.

Once you see it, you will think that this was obvious. Most innovation projects are that way.