It's HP's TouchPad tablet. Just announced yesterday - starting July 1 you can get (if you live in the U.S.) the 16-GB one for about $500, and an extra hundred will get you the 32-GB model. So, about what an iPad costs. And, an AT&T 3G model will come out later in the summer. It runs on WebOS - the operating system developed by Palm (HP bought up Palm last year). There are lots of WebOS fans. Might be a real competitor on the market.
The 9.7-inch screen sports a sensible 1024 x 768 display, much better for tablets than the tallscreen aspects seen in many Android tablets. There's also the 1.3MP webcam on the front, which embarrasses the iPad's sub-megapixel rear-facing camera, the dual-core 1.2-GHz Snapdragon processor, and the 740-gram weight (the Wi-Fi iPad weighs 601 grams, or 1.33 pounds).