The BlackBerry PlayBook developer beta OS 18.104.22.1680 is now available. This update provides a few new things so be sure to check it out. Remember this release is intended for developers and for testing purposes, so you install at your own risk. As always let us know your findings/fixes.
Here are the changes and enhancements:
Runtime for Android apps
Adobe AIR 2.x
Native API 2.x
If you have not registered for Beta OS 2.1 you may do so here.