I've been using Poynt, a search application which combines Google Maps with local directory information to help find businesses and other locations, on my BlackBerry Torch for a while. Now the same app is being rolled out with Australian data for Android and Windows Phone 7 users.
While Google's own maps application offers good search capabilities, the integration of business listings can make Poynt more accurate, and allows you to call relevant businesses directly. The Android version includes voice search, while the Windows Phone 7 release has support for that platform's pivot function.
Poynt is a free download for Android, BlackBerry and Windows Phone 7. Hit the link below for over-the-air download instructions on your supported device.