Others with excellent audio I did not see mentioned:
- Alison Krauss & Union Station Live - Doobie Brothers - Live At Wolf Trap - Faith Hill: When The Lights Go Down - James Taylor: Live At Beacon Theater - Norah Jones - Live in New Orleans - Steely Dan: Two Against Nature - Yes: Symphonic Live
I tend to keep my eyes open and chase down the DVDs with the best audio. So far it's paid off pretty well.