Have you seen Google Maps?
Unless you have been living under a rock (or have better things to do with your time) you will have seen Google Maps. Well, I only just tonight looked at them for the first time. Stunning! A spectacular web application. Highly usable and useful. And easy on the eyes! Here's a really good quick introduction to Google Maps from Peter Merholz's blog. . You'll find some screenshots illustrating key features, and some user interface commentary. And here's a link to google maps themselves. Check it out!