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RIM came in for some criticism for not only keeping their BlackBerry PlayBook tablet behind glass after the slate’s official unveil, but for not even having a unit on-stage during the announcement, leading to speculation that the Canadian company didn’t even have a working unit to show.  That’s obviously not been the case at this week’s Adobe MAX conference keynote, during which RIM CEO Mike Lazaridis whipped out a PlayBook for a demo.

Video after the cut

Together with Adobe CTO Kevin Lynch – rubbing his hands together at Adobe AIR 2.5 being so heavily baked into RIM’s SDK for the PlayBook – Lazaridis ran through Flash video, in-browser Flash content, multitasking, and some AIR applications from third party developers.

It all looks mighty slick, as you’d hope for a big on-stage demo like this, though of course there’s plenty of time before the PlayBook arrives in stores in the first half of 2011.  More information in the video below.