These guys created the amp that was used in the Alienware Hangar 18 HTPC. Looks like now they are going to offer a PCI/PCIe(?) based solution for those not wanting to use a separate av receiver. I'm not an audio guy, so I don't know what the specs mean, but I'd be keen to see what others think.
I like the idea of just the one box with everything inside and not having to get a separate av receiver for audio decoding and amplifying.