Now, the first thing I did was put DOOM 3 on it, and play on a glorious 48" flat screen. It played amazingly easy on the highest settings, so I decided to up the ante a little. I installed World of Warcraft to try. Now, most people assume that since WoW is a very old game (nearing 8 years now) it'll run on most any computer. At the lowest settings, this is true, but it gets much harder to run with more eye candy enabled. On ultra settings, it will bring even the most hardcore gaming rig to it's knees in a populated city.
Here is a screenshot of the settings I used:

As you can see, this is rated as "High" settings and full 1080p. Using these settings I managed to average 25fps, and though slightly under what is considered "playable" by most people, it still looked very nice, and was easily playable (or would have been if wireless lag wasn't so bad). In less populated areas I would easily get 35fps and higher, with my lowest being 14fps in the middle of Orgrimmar on a very horde heavy server. A playable 31fps was also achieved in most 5 man dungeons.
Overall, for the power consumption and price, this I believe is an amazing feat from such a tiny setup.