What can cubieboard be used for
Lightweight Linux Desktop - With USB mouse and keyboard and HDMI monitor to cubieboard, you can use it as a light weight linux desktop. Cubieboard support most of the ARM linux distributions such as Ubuntu, Debian, Fedora, Arch ARM Linux, Puppy etc.
Android TV - Connect wifi dongle and the wireless air mouse to cubieboard, and HDMI output to TV. You can enjoy Android with Youtube, Netflix and many more apps on cubieboard.
NAS - Cubieboard can drive 2.5 inch hard disk, you can use it as a home network file server.
Home Automation - There are 96 pin expansion headers on cubieboard, most of them can be used as GPIO. With network access, you can control a lot of things.