Over at BTF, Chris Dial has a rundown of each A.L. regular's value in terms of runs above (or below) average, using runs created for offense and converting zone rating into runs defensively...
Dial's methodology has Grady Sizemore as far and away the best player in the A.L. this year, with Ian Kinsler and Milton Bradley clumped together with ARod, Joe Mauer, and Kevin Youkilis a little ways behind him. Josh Hamilton is tied for 8th with Jason Giambi.
Of note is that Ian Kinsler, despite the huge error totals, doesn't grade out terribly on defense using Dial's system.