Drop by motherboards.org for a look at the Ultra Products Microfly SFF case, a perfect home for an HTPC system.  It might take a bit of planning to squeeze a full system in the box, but once you get it in, it should run nice and steady.
“Overall, I’m quite happy with the Microfly. This, of course comes after using it for a few days on end as a ‘Daily Driver’ type of machine. It’s sturdy, and has enough airspace that cooling is decent, without forward intake. On the whole, while there may have been qualms during the installation phase, things are working out nicely, and I’m quite happy with this case.”

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