Handster now has an impressive 815+ Android apps ported to the BlackBerry PlayBook OS 2.0 on App World. One of the latest is eBuddy messenger which is a cross platform instant messaging app. It connects to MSN, Windows Live Messenger, Facebook Chat, Yahoo, MySpace, Google Talk, ICQ, AIM, and Hyves through their app. It actually works ok on the PlayBook even through it seems to be a straight port though it does have an annoying bug of not being able to see what you are typing.
Either way if you are using the BlackBerry PlayBook OS 2.0 beta you will want to check out eBuddy free in App World