I was lucky to see The Ramones live twice -- that was crazy fun. My favorite currently-active-band live has to be Spearhead, though. Michael Franti takes the idea of a concert as a communal experience seriously, without the standard "Hello, Cleveland!" cliches. Oh, and the recent Pixies tour was just amazing, too.
Muse and Green Day Muse for their crazy lighting and staging Green Day for their crowd interaction and long play time
Muse i think are one of the greatest live bands around at the moment. Foo fighters are realy good live aswell