I was browsing the web looking for SNES ROMS on the Ouya and one of the websites near the top of the Google search list tried to install an APK as soon as I got to it. I managed to catch it before it did anything - no idea what it was or what it was supposed to do but it was worrying.

I now have the same security software on my Ouya as on my phone and tablet, 360 Security, it came out as the best security software on several Android websites when I was looking and it works fine on the Ouya, although you have to use the touch pad controls.