It only takes a quick glance to know: Here in late 2011, most new tablets are built for consumers. Only a few current ones, such as the RIM BlackBerry PlayBook andFujitsu Stylistic Q550 Slate, have been designed specifically for business. The PlayBook might be a little too tied-down for your tastes, in that it doesn’t offer its own e-mail client and must be tethered to a BlackBerry smartphone to get the most out of it. Windows-based slates like the Stylistic Q550, meanwhile, give you easy access to your business documents—but Windows isn’t ideal for touch input. (Also, Microsoft doesn’t yet offer an infrastructure for downloading free or inexpensive apps, like you have with Apple iPad or Android tablets.) These two tablets are pretty accurate representatives of the state of business slates today, so it’s clear that getting the best of both worlds (a consumer-like tablet experience, with all the versatility and security you need for business) hasn’t been possible—until now. Built around a 10.1-inch screen, Lenovo’s new ThinkPad Tablet has all the accoutrements you would expect in a device that bears the ThinkPad name. What sets it apart, though: It lets you keep your access to apps and features as open as your company will allow….