After rooting your BlackBerry PlayBook, you'll find that DingleBerry 3.x installs a very nice little application to your PlayBook. It's called HuluBerry and allows you to watch Hulu videos from a specially-designed browser on your PlayBook. If you live outside of the US, I'm afraid your Hulu dreams are dashed for the time being. Unless you can find a US proxy that plays nice with Hulu, that is. It should be noted that HuluBerry and DingleBerry 3.1 are not compatible with the latest PlayBook beta OS 18.104.22.16811. You'll need to be running 22.214.171.12449 or earlier for HuluBerry and the root to work properly.
HuluBerry is a most excellent application; but after restarting your PlayBook, you may notice that it no longer plays videos. Interestingly, it's not just the special DingleBerry-installed browser that no longer works, root access disappears as well. You notice it with HuluBerry because breaking the Hulu watching app is the most visible consequence of this. Every time your PlayBook reboots, it looses root access. Thankfully, the DingleBerry team anticipated this.
To get HuluBerry working again, you'll just need to connect your PlayBook to a computer with the PlayBook in Development Mode. A custom script - startup.sh - runs whenever the PlayBook is connected to a computer and Development Mode is on. As soon as the device connects to the computer (I usually wait until I've entered the tablet's password), you can disconnect it. The process regains root access to your PlayBook and returns all that Hulu goodness to the PlayBook's 7" screen.