Two laptops. The other one is ridiculously small, and since there's no real need for me to use two computers at a time I use it only rarely. I don't carry either of them around, my main sits on my desk and the smaller one is in my bookshelf. I own a smartphone but only use it like you'd use an old one. It's for phone calls and alarms.
My main laptop has Win7 and Arch Linux in dual boot. Since doing things with Windows is so hard I use it to waste time, and Linux when I intend not to waste time. Recently I've started shifting from point-and-click interfaces to keyboard-driven ones. Mostly, when I'm on my computer I just waste my time. What I really need is some "internet front end", a device on which to watch videos and listen music, and something to store files and create simple text files myself. Which means I could make do with a lot worse pc (in terms of GHz, cores, and memory).