Sure, the BlackBerry PlayBook isn't available for purchase yet, but that doesn't mean we don't think its the best! Laptopmag.com is having another voting event - following up their Smartphone March Madness they're doing the World Series of Tablets. The PlayBook has found its way to the finals, winning its way through the 7-inch tablet league. It finds itself up against the Exo PC, who actually beat the Apple iPad in the 1st round of the 10-inch+ league. Head on over and vote for the Playbook, and maybe it can win the Tablet World Series, before it is even released.