Bored at work, so I rooted the Playbook.
This video served as a decent guide for the process:
One thing to note is that the latest OS2 beta (2.0.0.6149) doesn't work with Dingleberry, so you'll have to downgrade back to 1.0.8.6067 or 2.0.0.4869.
If you've gone to 2.0.0.6149, someone figured out a way to downgrade back to 2.0.0.4869 by inserting a couple files into the update process. Steps to restore are here:
is it possible to update (or downgrade) to 2.0.0.4869 using a local copy of os? - Page 3 - BlackBerry Forums at CrackBerry.com
You'll also need the backup RAR:
https://rapidshare.com/#!download|22...BA3304C3E0|0|0