Thomas Landspurg has ported over J2ME Maps to the Blackberry platform. J2ME Maps is a program interface that lets you communicate with Google Map. Features include satellite and map views, zoom, search requests, and the ability to save your favorite locations. J2ME Map also uses JSR179, so theoritically it is possible to get your location via GPS. But the GPS feature has not been tested by the author.
To download, visit on the link below:
http://j2memap.landspurg.net/J2ME_Downloads.html
