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When you stack them up on top you can see the PlayBook is thinnest with the others about the same.
The HTC Flyer is just a bit narrower than the BlackBerry PlayBook, but enough that it lets you put the Flyer in my pants pocket.
You will find a front facing camera on the Flyer, although I haven't yet found a video chat application to use with it. The Snapbooth application lets you use it to take crazy self-portraits.