Here are links to a few videos of note:

moe.‘s "Happy Hour Hero," as soundtrack to Saranac Brewery

A moe. cover with international flair

Led Zeppelin circa 1973, "Since I’ve been Loving you"

Trey Anastasio with Matisyahu, Bonnaroo 2005, "Close My Eyes"

Bela Fleck and the Flecktones, Live at the Quick, “Big Country”

Oysterhead, "Polka Dot Rose"

Widespread Panic, "From the Cradle," 5/9/06, from Earth To Atlanta

"Levon Helm: Dirt Farmer"

Phil Lesh & Friends (Osborne, Scofield, Campbell, Barraco, Molo and Osby ), "Help On The Way," 5/19/06

Radiohead at Bonnaroo 2005, "Idioteque"