Scott had a guest on Home Theater Geeks this week named Michael Fremer. He is a pure audiophile and enjoys it because of his "golden ears" (being able to pick up on subtle musical cues). He says that high resolution audio is a great development. Leo says that paying more for HiRes audio is a subjective thing. Most won't be able to really enjoy it like someone with golden ears, but if it sounds better to him, then it's worth it. Scott says that at AVS forum, he's conducting a sound experiment to test whether people can really identify high resolution music from standard music. Scott says that more than 50% of the time, people can't. And he's inviting everyone to participate. Go to AVSForum and search for "AVS/AIX High-Resolution Audio Test:" Let Scott know which ones are high res and he'll let you know if you're right!
Philips is also running their own Golden Ear Challenge which can train your ears what to listen for.