HP today unveiled its upcoming TouchPad tablet device, a likely rival to the iPad. Looking remarkably similar to a first-generation iPad, the TouchPad features a 9.7-inch, 1024x768 multi-touch screen—the same size and resolution as the iPad—a weight of 1.6 pounds—the same weight as an iPad 3G—and measures 7.48 inches x 9.53 inches x .54 inches, or just slightly wider, shorter, and thicker than the first-generation iPad, which…