Like the HP TouchPad, the BlackBerry PlayBook never got traction in the market and is now being sold off.
However, it does have one advantage compared to the webOS-tablet: the QNX operating system the Blackberry PlayBook runs is able to emulate another operating system in real-time. In other words, it can run Android apps – you'll be able to install the Android Market and use Android apps on your Blackberry PlayBook.
RIM, the BlackBerry maker, originally intended developers to repackage their Android apps and submit then into the BlackBerry App World, but few are actually doing so. Which is, to say the least, a lot of unrealized potential, since the Android Market is now boasting over 400,000 apps.
So, what do you do? Of course, install the Android Market on your Blackberry PlayBook. First up, you'll have to root your PlayBook with DingleBerry, then sideload the Honeycomb launcher (from Android 3.0) using DDPB. When that is done, you can finally install the Cyanogen Google Apps, which include the Android Market, and after a reboot and some more tweaking you'll be finished.
The whole process is pretty complicated, and not every app will work correctly. But if you think you can manage it, why not head over to CrackBerry where they have a full guide, and give it a try?