Developers Chris Wade, neuralic and xpvqs have successfully rooted the BlackBerry PlayBook, coining the yet-to-be-released tool DingleBerry. Not only will this tool allow you to gain root access to your PlayBook, you will also be able to enable viewing Hulu in your browser.

Below is a video demo of a rooted PlayBook:

You can find more information at CrackBerry as well as a video demo of Hulu running on the rooted PlayBook.