Dr. Waldrep from AIX Records is starting a new website for hi-res audio downloads. If you have any of the AIX DVD-A disks you already know how well they are produced. The site should be up soon, you can find it here- http://www.itrax.com/
. He will offer various formats including 96/24 5.1 tracks with no DRM. If you have a HTPC or media server this will be great resource for hi-res music, I'm looking forward to it.
Linn Records also has excellent hi-res downloads which I have purchased, although they're stereo and not multi-channel.