Benchmark Reviews posted a review on the ASUS Xonar HDAV1.3 Slim Sound Card

You don't have to be an audiophile to appreciate the enhanced surround sound effects from Dolby TrueHD or DTS-HD Master Audio found on most Blu-ray Disc movie discs over the standard Dolby Digital or DTS formats found on standard DVD movie discs. The lossless audio compression formats and/or the two extra channels of sound output really adds a significant amount of realism to the whole movie watching experience. The problem is most HTPC owners don't have the ability to experience these enhanced formats due to a lack of sound cards on the market that can support these formats. Benchmarkreviews has the ASUS Xonar HDAV 1.3 Slim sound card that does just that. Benchmark Reviews have put it through a series of tests and have determined whether HTPC owners can rejoice or not.

ASUS Xonar HDAV1.3 Slim Sound Card Review