Good Gear Guide
In pictures: Free Android apps for BlackBerry Play...
Google Maps for BlackBerry PlayBook
Google Maps has always been one of my favorite online-mapping and navigation apps on a variety of mobile platforms, and it's probably the best such software on the PlayBook, even though it's an Android app and turn-by-turn navigation doesn't seem to work on RIM's tablet. However, the maps functionality works well, as does the basic GPS location feature, the driving- and walking-directions functionality and public transportation schedules, etc.
In pictures: Free Android apps for BlackBerry PlayBook, 10 best downloads