Arcade Fire the other year. Hands down the most accomplished musicians I've seen live. The constant band member instrument-switching gave me a throbbing hard-on.
Pearl Jam - MEN June 2012, best live band i've seen by far, and i've seen bands that include Kiss, ACDC, Metallica, RATM, Faith No More, Def Leppard etc...
I saw geno Washington in the zanzibar once, pretty spectacular . Bob Dylan at Wembley was class but I think the black keys are the best live band i've seen.