Shizukana

Vic Wooten all freaking day long.

And twice on Sunday, just for good measure.

Runners up - Les Claypool of Primus/various side projects (edited in, oooops), Flea of RHCP, Robert Trujillo (currently Metallica, formerly Suicidal Tendencies and Ozzy's backup band), Jeff Ament of Pearl Jam, P-Nut of 311, and the bassist from Faith No More (but I can't remember his name off the top of my head.)

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"The power of accurate observation is frequently called cynicism by those who don't have it." - George Bernard Shaw