When you think of a tablet, typically you're going to picture a device with a screen somewhere in the seven to ten-inch range. HP, however, is thinking a little differently, as it unveiled a 21.5-inch tablet earlier in the day. This Android-powered tablet is called the Slate 21 and it's being billed as an all-in-one computer, with NVIDIA's Tegra 4 running the show. The Slate 21 features a 1920x1080 IPS touchscreen with an HP TruVision HD webcam, dual band wireless, Wireless Direct, and DTS Sound, although other specifications are kind of lacking. On the rear there's a kickstand that allows for the Slate 21 to be stood upright or dropped down to a 30° angle, hopefully so it could be used as a drawing pad. The best thing about the HP Slate 21 is it's set to arrive this September for a mere $400.