The BlackBerry PlayBook is no longer supported. Publishers did not show enough interest in creating apps for the platform to justify the development and testing resources.
If you want your app to appear in Android Market, you probably want it to appear in Amazon Appstore as well.
On Android, folios with PDF articles are not supported. Use a different image format. The Android Market viewer is up to date. We're still waiting on Apple and Amazon to approve.
I'm not sure if you're asking whether you can create a single app for each platform or a single folio for each platform. Apple uses the .ipa format and Android/Amazon use .apk. You need to create and submit separate viewer apps. Use the Viewer Builder to create apps.
Here are some links:
Even the BlackBerry PlayBook is no longer supported by Adobe DPS, it is supported by BlackBerry. Use your Android DPS viewer (Amazon version) to make BAR file format for PlayBook:
I don't have PlayBook to try it yet, but got BAR file with no problems. It should work.