Amazon's Yellow Pages which I've never really used before is now unbelievably cool. They compiled a huge index of street level photos by mounting digital cameras on trucks and hooking them up to GPS. So let's say you want to find a dentist in San Francisco. Look that up on Amazon and then see a picture of the front of the building. That's my dentist and I'm going there today. Seeing what the place looks like makes a huge difference.
Now maybe Craigslist will start hooking into this for their apartment listings—that would make things a lot easier.