Comparing On-Line Map Providers by Google Maps Mania (Aug 23)
Interesting - meta search for online maps.
"Maps Compare is a website with four different on-line map services on one page. The site places Google Maps, the Google Earth browser plugin, Yahoo Maps and Bing Maps beside each other, which can be quite useful if you want to compare the map coverage provided by each provider in different locations."
And there are others.
+ Where's the path
+ Dual Maps - Google Maps, Bing Maps and Google Maps Street View all under one control.