Ian,
I see on your front page that you have interest in getting one of these "iffy" soundcards. Read the review at Gaming in 3d here > http://www.gamingin3d.com/reviews/rev71/. The card has very unpolished drivers no analog or spdif cd connections it uses the IDE cable for cd audio which I don't care for, but most don't seem to care. It does though have great sound quality, but until the drivers are improved upon greatly then I would avoid it like the plague. The avsforum has a fair amount of topics on the problems with the Revo many of the posters have HTPC's and they weren't too pleased with the it some got it work some didn't.