I really think case size is important for a good HTPC, no point having a full atx desktop or tower case, ruins the entertainment center

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My HTPC
Asus Pundit Booksize (more like VCR size)
Intel Celeron D 2.8GHz
Kingston 512MB DDR400
Samsung 160GB
CD-Rom (I know, need DVDRW)
PowerColor ATI Theater 500 PCI
PowerColor Radeon 9000 PCI
Windows MCE 2005
Works like a champ & looks great, used a Shuttle SFF before this one, but looked out of place.