The backside has a rubbery, soft-touch finish that's easy to press your fingers up against. (It also hides fingerprints and looks good, to boot, so that's a plus.) Additionally, there's some slight beveling on the front side of the device around the display -- just enough that there's a little groove where you can rest your thumbs.
ENGADGET: Vizio Tablet PC hands-on (update: now with video) Hands-on