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If there is a Guinness Book of World Records entry for Largest Tablet, the Sony VAIO Tap20 would be it. This is basically an all-in-one Windows 8 PC with a 20-inch, 1600x900 capacitive 10-point multitouch screen. But...it actually has a built-in battery with an alleged life of 3.5 hours. At its size (140 sq. inches, 11.4 pounds), you'll probably only lug it around your home or office, setting it up in flat or reclining mode (with the rear kickstand). Specs are full PC-like, with your choice of Intel Core i3 to i7 processors, 8 GB RAM and up to 1 TB hard drive space. Alas, you pay for what you get, with a Japan price of between $1,800 to $2,300.