Let's see...
Nine Inch Nails, several times (including openers Peaches, Bauhaus, Queens Of The Stone Age, Death From Above 1979, Explosions In The Sky)
Rasputina (cello rock), several times
Apocalytica, ditto
Zoe Keating (solo and with Rasputina)
Placebo
Silverchair
Amanda Palmer (I cried as hard as I danced)
Tegan and Sara
Semi-Precious Weapons
Yeah Yeah Yeahs
Art Vs. Science
Sigur Ros
Cursive (a few times, including the night I met mr. mini-mart)
Foxy Shazam
Iggy and the Stooges
Those are the larger names of the top of my head. My ultimate must-see is David Bowie. Sadly unsure if I will ever get the chance.