IMO, the rankings go:
Twins- led the league in ERA, Santana and Radke-best 1-2 and great pen
Yankees- solid pen w/ Rivera and a deep rotation
Red Sox- good pen, good starters but inconsistent ones except for Wells and Schill
White Sox- best pen in the AL, solid rotation, but inconsistent starters
Then: OAK, ANA, CLEV, TOR, BAL, DET, SEA, TAM, TEX and KC