BLD, does it contain 20 tracks, and the first track is named "A Star Within A Star" and the last track is named "All To Heaven / A Particularly Beautiful Day"? If so, congratulations, you have the fan-compiled, DVD-ripped mutt that we've been discussing in the last few posts. As Jan said, it's most likely ripped from the surround channels of the DVD.
Here's another post by someone who ostensibly presents himself as John Murphy that supports the speculation above that the soundtrack release was somehow delayed by the Underworld album.
http://www.imdb.com/title/tt0448134/...d=85407238&p=1