Here is a simple example, lets try and find the following address: 240 St. Joseph Ave, 94115.
Live Maps / Live Local / Local Live / Virtual Earth finds it with no errors or warnings.
Yahoo Local Gets the right location after using the closest match "240 Saint Josephs Ave, San Francisco, CA 94115".
Web 1.0 Mapquest can't find the address but it does suggests the correct location.
Ask Maps & Directions can't find the address but focuses the map on the correct zip code.
Google Maps can't find the address, the closest possible match is someplace in Missouri.
I believe that all these mapping sites get their data from the same place, NAVTEQ, but some are better than others at using that data.
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