It's not rare to hear talk of other operating systems employing webOS-like elements -- we've been asking to see its elegant notification system in iOS for years -- but RIM's BlackBerry Playbook borrows so heavily from the UI concepts of the software built by Palm and now owned by HP that it could easily be confused for a webOS tablet. It handles multiple concurrent applications using a card view and allows you to shut down unwanted apps by swiping them off the screen, a multitasking implementation tha