I've been watching the recent Mormon Tabernacle Choir Christmas concerts, and here are more "greatest hits".
Here is the opening processional from the 2008 concert:
Renee Fleming from 2005:
The First Noel, with some moments of power, and others of exquisite, quiet contemplation:
Here is a history of Christmas concert guests from Wikipedia:
2001: Actress Angela Lansbury
2002: Former CBS Evening News anchor Walter Cronkite
2003: Mezzo-soprano Frederica von Stade and Welsh baritone Bryn Terfel
2004: Actress and singer Audra McDonald and actor Peter Graves
2005: Soprano Renee Fleming and actress Claire Bloom
2006: Norwegian vocalist Sissel
2007: London-based King's Singers
2008: Broadway singer Brian Stokes Mitchell and actor Edward Herrmann
2009: Jazz singer Natalie Cole and author and historian David McCullough
2010: Pop singer David Archuleta and actor Michael York
2011: Operatic baritone Nathan Gunn and actress Jane Seymour.
You can catch a PBS broadcast of the concert from the prior year. David Archuleta's concert is broadcasting right now, and again Christmas Day here in the Portland metro area.