Hi all,
Just found this out, and seems to be fairly little documented feature. Maybe you don't all know it.
If you press up and down volume buttons simultaneously then PlayBook will take a screen shot of current screen and save it in Photos folder.
Let me know if useful!
EDIT: Ok, So I found out about this, got a bit excited, and posted without checking what else had been written on the matter. I feel a little dumb now, so let's say no more about it, eh?
Chris.