Sony's double-screened Vaio P Tablet comes with "4G" internet via AT&T, dual 5.5" touchscreen displays, and a selection of apps optimized for the new format. Running Android 3.2, the data plan costs $35 a month for 3GB and $50 for 5GB. At $550, though, it'll be a difficult sell. With a two-year contract–itself a thousand dollar proposition–it's $400.
Product Page [Sony]