K-Lo has a list of switchers:

Yea to Nay (1)

Stabenow

Nay to Yea (17)

Bennett

Bingaman

Bond

Boxer

Burr

Coleman

Collins

Domenici

Ensign

Gregg

Lott

McConnell

Murkowski

Snowe

Stevens

Warner

Webb

NV to Yea (1)

Brownback

NV to Nay (3)

Barrasso

Coburn

Enzi