Windows 7 on my desktop and laptop, I have a box running FreeNAS (FreeBSD derivative) and my HTPC running a very minimal Ubuntu 13.04 with XBMC. My phone is a Nexus 4, so the latest Android. I plan to install Windows 8.1 when it's released on my desktop and laptop, unless the *buntu betas impress me. As general operating systems most Linux distributions are fine, but they're lacking in screen magnification. Most desktop environments have it, but none have satisfactory focus tracking (or any at all), which makes it unusable as a productive environment. Microsoft really took a leap with the magnifier application in Windows 7, for my needs it is on par with specialized accessibility applications, where in XP/Vista it was "bearable".