In the absence of a Home button, there's a new UI convention to learn: You touch the frame along the bottom of the screen and swipe up when you want to return to the home screen. Touch sensitivity is very responsive, and the swipe controls work great.
Taking a note from Palm's webOS, RIM brings multitasking to its QNX-based BlackBerry Tablet OS, letting you switch back and forth between simultaneously running apps. By swiping a finger to the side of the screen, you can jump from the YouTube video you were watching back to a paused game of Tetris, without having to return to the home screen.
Also cool: the ability to multitask with apps running on a peripheral display. When the PlayBook is hooked up to an HDTV, you can watch video at 1080p on the big screen while browsing the web on the PlayBook. Or, you can show a presentation on a projector while swiping through your speaking notes on the tablet.
Be forewarned of resource hoggery, though. Try running too many apps at once, and a low-memory notification will pop up in the left-hand corner telling you to cool it. The PlayBook comes loaded with 1 GB of RAM to protect against this, though on occasion when I ignored the warning long enough, my browser crashed.
Move closer to the software level and things get even stickier.

Any tablet debuting more than a year after the Apple's market-dominating iPad needs an edge. For the PlayBook, that edge is support for Adobe Flash, a feature that the iPad is famously lacking. RIM says it took over two years of working with Adobe to bring Flash to its tablet.
Two years may not have been enough. During a round of Plants vs. Zombies, gameplay bogged down whenever the animation got intense. Every time I tried to access a Flash game on Facebook, the browser crashed. Yes, every single time. Say goodbye to your well-tended crops, Farmvillians.
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