We just spent some time with Ryan Bidan, senior product manager for the PlayBook, who gave us a hands-on demo of BlackBerry Messenger on RIM's little tablet. It's not a native app -- it requires the PlayBook to be paired with a BlackBerry smartphone via BlackBerry Bridge. The functionality is being pushed out "tonight" with a Bridge update on the handset side, and an OS update on the tablet side. So if you and your PlayBook have been longing to get your BBM on, today's your lucky day -- assuming of course that you have a BlackBerry phone on another network than AT&T. Expect a standalone app sometime in the future, but in the meantime hit our video above for the full demo.