Ouya is also giving Raspberry Pi some competition. So are lots of other $99.00 and less ARM computers.
You can also go crazy and buy top of the line $600.00 systems like Samsung Galaxy S4 with a built-in 1920x1080 touch screen, gps, cellphone, radio, compass, everything but the kitchen sync. And you get a very nice quad-core ARM CPU @ around 1.6Ghz per core + a fancy 3D floating point math core for 3D gamez, 1 GB RAM, etc. etc.
Its a whole lot more than a Pi but it has a built in touch screen and those are expensive. It also has a massively better CPU.
There are a great many ARM based computers to choose from that can run Linux and/or Android and/or something else.
Arm is everywhere.