Google Maps API V3 has a Styled Map feature that allows developers to change the look of Google Maps.
Justin O'Beirne of Latitude41, has created some awesome Examples of Styled Maps Using Google Maps API Version 3. His first post proved so popular that he went on to create Additional Examples of Styled Maps Using Google Maps API V3. The new styles include a few examples mimicking the styles of other online map providers.
I've created Goog Map to show off some of Justin's examples and a few styles of my own - all on one map.
To change the style of the map click the white links that run along the top of the map.