OSBBx has finally launched their App Centre for the Playbook. The App Centre is for open source apps, you can download them to the Playbook or your computer.
PB Version: Localbar 2 support built in for on-device installation
Win Version: BAR installation tools built in allowing for download and immediate installation
Browse the latest emulators and open source applications right from your PlayBook
Check out their website for the download and more info.