Many benefits Dom...

1. This software isn't dependant upon a GPS receiver to give you directions.
2. This app is small, and doesn't require GB's of maps.
3. This just needs an active internet connection and you can zoom in.
4. Satellite pictures.
5. Can overlay traffic on top of map, provided you are in an area that provides traffic information.
6. You can literally pull up anywhere without having to find the correct map, if your maps are broken down by region.
7. You can locate businesses, and search for businesses close to a certain vicinity.
8. You don't have to carry a GPS receiver.
9. You don't have to charge a GPS receiver...

So there are many advantages to this over a GPS receive and software. Drawbacks including that you MUST be online to pull the map.

Virtual Earth is also very similar to Google Maps, and both look like they will compete with each other, plus VE uses Microsoft's maps, while Google uses Google's Maps.

I am sure both of these software would help anyone that didn't want to carry around a GPS receiver.

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links