I quite like using Geofabrik's MapCompare tool for things like this. For example, take a look at http://tools.geofabrik.de/mc/#14/-39.2756/-71.9824&num=4&mt0=ma

I quite like using Geofabrik's MapCompare tool for things like this. For example, take a look at http://tools.geofabrik.de/mc/#14/-39.2756/-71.9824&num=4&mt0=mapnik&mt1=google-map&mt2=bing-map&mt3=nokia-map http://tools.geofabrik.de/mc/#14/-39.2756/-71.9824&num=4&mt0...