As you might be or not be aware, a new audio standard exists, it's DVD Audio.. while doing a research for another thread (the collection one), I managed to find that there are already many DVD Audio albums available.. some from Rhino or Warner.

What is DVD-Audio?
DVD-Audio is a format specifically designed to provide the highest possible audio fidelity capable on DVD. The audio fidelity of DVD-Audio far exceeds the quality of conventional CD's and audio on DVD-Video.
DVD-Audio takes advantage of the large storage capacity, speed and flexibility possible with DVD. DVD-Audio provides for audio in stereo and in multi-channel surround in a wide range of specifications. In addition to audio, a DVD-Audio disk can contain a limited amount of video, which can be used to display text, such as lyrics or notes; or stills such as a photo album. Up to 16 graphic stills can be associated with each track and on-screen displays can be used for lyrics and disc navigation. As an option, a DVD-Audio disc can also include audio tracks recorded in the DVD-Video specification (Dolby Digital and DTS) for compatibility with DVD-Video players.
A DVD disc is capable of recording video, audio and data information of many different types and formats. An industry group, named the DVD Forum has responsibility for establishing the industry standards and formats for DVD. In 1996, The DVD Forum released the DVD-Video format, which was designed to deliver video at a quality exceeding VHS tape with surround sound and better than CD audio. Before defining a DVD format optimized for audio, the DVD Forum sought the opinions of the music industry and audio equipment manufactures. In January 1998, the DVD Forum’s Working Group 4 released a draft DVD-Audio standard. In July 1998, the DVD Forum released the preliminary 0.9 version. In March 1999, the DVD Forum released the final version 1.0 of the DVD-Audio specification.
BTW, I didn't follow the news to check if DVD Audio won its battle over SACD.
You can check http://www.dvdaudiopreview.com for a list of DVD Audio Discs available, as well as http://www.digitalaudioguide.com/buydvdnow/dvd-audio.htm for info and buy DVD Audio Discs as well..
BTW, a DVD Audio at top quality can store 64 mins of music, but they did a standard that "zips" the music hence you have 2 hours of audio on the DVD.