number2301 said:
As for why you would buy it, have you tried building a media centre PC? You can go small enough to match a set top box with no power to run games, or powerful enough to run games but 2-4 times the size of a set top box. I expect you'd be looking at Alienware X51 size or similar for the Steambox.
That's not exactly true anymore. With stuff like micro-ATX motherboards, you can build a very hefty gaming/media PC that has a surprisingly small amount of bulk to it. I'm currently in the middle of putting together a micro-ATX PC. The BitFenix case it's going in is not that large at all, but it's still going to have a 3.9GHz six-core CPU, 8GB of RAM, dedicated soundcard and a 1GB Radeon HD7700. That's more than powerful enough to play any game out there, and this is all stuff I bought for a mid-range budget. If I wanted to, I could have got myself a monster Intel CPU, the top of the range Nvidia GPU and enough RAM to choke a donkey.
Sure, it's never going to be as small as a mini-Mac, but it's much, much less bulky than your average desktop PC, and much easier to carry around and plug into the telly.