We just received confirmation that RadioShack has begun accepting pre-orders for RIM’s upcoming BlackBerry PlayBook tablet. You can reserve yours for now $499, and RadioShack says it will be available starting on April 19th. The PlayBook sports a 7-inch touchscreen display with 1024 x 600-pixel resolution. It’s powered by a 1GHz dual-core processor, runs RIM’s sleek new QNX operating system designed for tablets, has 1GB of RAM, and offers both a rear-facing 5-megapixel camera and a 3-megapixel forward-facing camera for video chat. We’ve had plenty of hands-on time with the PlayBook and are excited by the concept, but we’ll take a much deeper dive once we review the device. If you love what you’ve seen so far, however, feel free to hit the jump for a link to RadioShack’s pre-order page.