Maps

Following are few maps that i use quite often

Google Maps
Yahoo Maps
Windows Live Local
Map Quest

Following are few comparisons between the maps

Try this for a 2 way comparison(Google vs. Yahoo):
sergeychernyshev.com

Try this for a 3 way comparison(Google vs. Yahoo vs. Windows Live Local):
maps.idelix.com

Try this for a 4 way comparison(Google vs. Yahoo vs. Virtual Earth vs. Terraserver):
ocarto.com