If you mean as a user with an Android app that you want to run on your BlackBerry, no.
If you are an Android developer, there will soon be an emulator (or as RIM calls it a player) that will allow Android applications to be repackaged (perhapse needing to be recompiled) to run on a PlayBook.
There is some speculation that the BlackBerry Tablet OS is the prototype for some future generation of BlackBerry handeld device OS. If this actually comes true then we can probably expect that the player, if successful, would also be available on that platform. But at this point that would be speculation.
Not that i know of. But if you're developing from scratch you can try a cross platform mobile framework such as appcelerator phonegap or adobe air
If your application was build with phonegap then you're in luck. Your application was built using standard web technologies like HTML5 Javascript etc. The phonegamp software is a wrapper that lets you native api calls for your particular phone. All thats left to do is deploy to your targeted device.
The pages below show how it works and what oses are supported
http://www.phonegap.com/about
http://www.phonegap.com/features
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