The closest thing I have seen, and it isn't exactly what you want is the new version of BB411 ca do Driving Directions fron the address book, unfortunately no map though.
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-Brad
RIM 950 > Nextel 6510 > Nextel 7520 > Cingular 7100 > Cingular 8700 > Cingular 8800 > Cingular 8300
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