Old Springs Pike, they're brilliant. Four people: two on acoustic guitar and two switching off between the tamborine, the melodica, hitting empty bottles, and stomping. Four-part harmony. Also 3/4 of the band are actors so their banter is amazing.
Shoulda, Woulda, Coulda:
http://youtube.com/watch?v=0QN_kMEQKh0
[it's pretty much Beatles covers and banter]
MTV Special:
http://www.mtv.com/overdrive/?id=1567944&vid=171543