Other than the slightly unusual hardware features, the Lenovo ThinkPad Tablet Tablet is also outfitted with some interesting new user interface enhancements. Some of them work well, but others aren't as impressive.
The thing first you notice about the main screen is that Lenovo has added a Launcher widget in the centre of the screen where you can quickly start the internet browser, open a book, watch a movie or listen to music. The widget really only sends you to an app - Slacker Radio for music or the mSpot app for movies. For new users, the widget is a smart idea because it calls attention to main features on the device.
Another addition is the App Wheel. There's an icon on the lower centre of the screen - press it and you'll see a circle menu you use to start an app. This is different from the pop-up menu included with Android that shows you open apps - this wheel is for storing favourites. The App Wheel looks a bit clunky though, with an unconvincing drop-shadow. Also, it's easier to just store apps on the desktop.
Both of these are just extra UI icing on the standard Android 3.1 interface. There are no radical interface overhauls like there will be with the Amazon Kindle Fire. There are also no app categorisation bins like there are with Samsung and Acer tabs, although these bins don't add a lot of value.
Many of the other interface features are standard - you can drop widgets onto the main screens. None of these stray too far from the norm - Lenovo hasn't added any extra widgets. There's a back button on the lower left-hand side and a Home button in addition to the pop-up app menu.
One oddity, though, is that the hardware buttons on the left of the screen require that you press them close to the screen. If you press near the edge, the button might not work. In daily use, you might just skip these buttons altogether.