If you're still using the prerelease tools to publish a custom viewer before prerelease ends, use the Drop 11 tools and documentation on the prerelease site.
The prerelease site also includes the Publishing for iPad Viewer companion guide, which walks you through the steps of creating the required certificates, splash screens, and icons for submitting a custom viewer app to the Apple App Store.
To learn how to create a custom viewer app to submit to the Android Market, go here:
The prerelease Downloads section also includes a readme that describes how to install the Adobe Content Viewer on a PlayBook device. However, the Viewer Builder does not provide the ability to create custom viewers for the PlayBook at this time.
If you would like to provide feedback on any of the documentation, feel free to contact me: firstname.lastname@example.org.