There is also the Imerge Soundserver, which is OEM'd by a number of people as well as sold by Imerge themselves (imerge.co.uk). The Cyrus unit is a version of this. And there's the Linn Kivor, which comes in two versions; expensive and really expensive.

I've got an Imerge, works well, doesn't require a PC infrastructure to be in place, and supports compressed and uncompressed. It also does multi-room distribution, if that's important for you.

Regards

Mark