Bigbruin.com has posted a review on the ASUS Xonar D1 PCI Audio Card
The ASUS Xonar D1 is a 7.1 channel solution designed to fit into full sized or low profile systems, and offers exceptional audio in 3D games and home theater applications. If you are serious enough about sound to realize that the onboard solution just isn't cutting it, the Xonar D1 is worth considering. It offers great sound, appealing features, and it won't break the bank.ASUS Xonar D1 PCI Audio Card Review