Lenovo Yoga 2 10" Android + 64GB SD Card
This is the computer I by far use most in my private time. Right now, riding on the train, in fact. I've just about stopped "lugging" my macbook air about. I don't use the MB Air anymore right now - moved all my E-Mail this. 18 hours of battery time, tons of movies and serials (watching agents of shield right now), 60+ books, especially those with 1000 pages or more, 6GB of music, awesome Games (The Wold among us f.e.). It's a state of the art mobile computer, one generation short of total convergence.
Moto G2
My fresh dirt-cheap high end cellphone. Definitely a computer, definitely my second most used one.
Lenovo W510
Refurbished and pimped out with 18 GB RAM, 256 GB SSD and Ubuntu 14 LTS - for serious web work and fiddling with FOSS. I'm pondering leaving the Apple Golden Cage (TM) - but am not quite sure yet. There are some pretty awesome software tools available for OS X, especially in the webdev dept.
Lenovo T400
Refurbished and bought as a cheap, small and quiet utility (web) server to fiddle with and run deployment and scripts on. Xubuntu 14 LTS.
2011 MacBook Air
Neat and trusty. Great device. The Yoga kicks it's ass in portability and battery time though.
2007 Mac Mini
Second-gen Intel Mac Mini. Very nice computer, still doing its work. But I only use it as a media center right now. It still runs Snow Leopard ... Tiger? Don't now. It has front-row though, and I use it with the remove a lot.
Xbox 360, last gen with Xbone Enclosure. Dirt cheap console, dirt cheap AAA games. I pondered getting a console for almost 10 years and picked this one up as the Xbone was out a few months. Very good deal.
At work:
27" iMac, refurbished. 24GB RAM
All in all I'd say I have to many computers and probably will consolidate the amount at my next hardware redo which happens every 4-5 years or so.