Blackberry's PlayBook tablet
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Blackberry reveals PlayBook tablet

The company behind the Blackberry phone has unveiled the PlayBook tablet, set to launch in early 2011.

Research in Motion is hoping the device's size and weight will rival Apple's iPad.

Mike Lazaridis, president and co-chief executive officer of Research in Motion, outlined some of the PlayBook's key features at a developers' conference in San Francisco in the US.