The Lenovo IdeaCentre A720 big-screen all-in-one PC measures 27 inches diagonally. But it's also thin, with a display thickness of 24.5mm (0.97 inch), which Lenovo is claims makes it the world's thinnest. Adjusting to the dimensions can be kind of tricky: When I walked in to Lenovo's booth, I couldn't get over the size of the screen--and the thin frame makes the whole thing all the more deceptive.
But there it is: thin, massive, and impressively configured with a Core-i7 Sandy Bridge CPU, 8GB of RAM, up to 1.8TB of storage space (with solid-state drive options), a 2GB discrete graphics card, and a slot-loading BluRay player. The screen has a maximum resolution of 1920 by 1200 pixels; and fittingly for an All-in-One, it supports ten-finger multitouch.
Its weight seems a bit on the heavy side, but the solid metal chassis is gorgeous, with an attractive, clean finish. Like the Vizio all-in-ones that I saw earlier today, this PC has its innards tucked into the base, allowing the screen to achieve its superslim profile.