Get Yeself a 7 inch tablet. Can use it lying on your back, holding it with one hand. Affordable, plus it makes you look and feel like you're doing something important. Can't stay away from Starbucks (free WiFi) because of it, and coffee makes me hurl.
7 inches is not big enough
Tablets have no keyboard or mouse. I couldn't imagine typing some of my more long-winded posts on those things, or playing some of the games I like without a mouse. And speaking of WiFi I don't even have it at home; my Internet still comes through a cable from the modem to the PC (well, why not? I only have one computer and it's not mobile.) Do those tablets even let you plug in a cable?