Well just saw AC/DC again on Friday. Great fricken show! Updated list:
Metallica (12 x since 1989)
Megadeth (x2)
Pantera
Guns N Roses
Iron Maiden (2x)
Korn (3x)
The Rolling Stones
Godsmack (2x)
Ozzy Osbourne
Black Sabbath
Trivium
CCR (Creedence Clearwater Revisited)
Bush
Marilyn Manson (x2)
Type O Negative (x2)
AC/DC (x3)
Kiss (x2)
Aerosmith
Bryan Adams
Sepeltura
Monster Magnet
Powerman 5000
Jewel
Backyard Babies
Iced Earth
Pearl Jam
Alice in Chains
Train
Bob Dylan
Faith No More
POD (x2)
Great White
Twisted Sister
Poison
Slayer (x2)
Kittie
Drain STH
Alice Cooper (x2)
HIM
Papa Roach
Murderdolls
Lacuna Coil (x2)
Deep Purple
Santana (x2)
Chroming Rose
Bon Jovi
NOFX
Guano Apes
Slipknot
Apocolyptica
Green Day
Eric Clapton
BB King
Allanis Morrisette (uggh that was terrible, but she was at a festival I was at)
Skunk Anansie
Heather Nova
Sting
Die Totenhosen
Rammstein
Rage Against The Machine
Oasis
Deftones
Limp Bizkit (terrible as well but at a festival that I was at)
Kid Rock
Radiohead
3 Doors Down
Linkin Park
Tool (x2)
Lenny Kravitz
Neil Young
System of A Down
Disturbed
Queens of the Stone Age
Zwan
Judas Priest
Motorhead (2x)
Nickelback
Puddle of Mudd
In Flames (2x)
Overkill
Anthrax
REM
Billy Idol
Mudvayne
Motley Crue
Bullet For My Valentine
Opeth
Soulfly
Stone Sour (x2)
Avenged Sevenfold
Def Leppard
Van Halen (well if you can call it that, it was with Gary Cherone at vocals)
Fear Factory
Velvet Revolver (x2)
Meschuggah
The Cure
Rob Zombie
The Black Crows
The Goo Goo Dolls
Ted Nugent
Sevendust
Soil
Alterbridge (2x)
The Darkness
Eighteen Visions
Live
Drowning Pool (with original singer a few weeks before he died, RIP)
Cradle of Filth
Hinder
As I lay Dying
Chimaira
Dragonforce
Billy Talent
Linkin Park
My Chemical Romance
Evanescence
The White Stripes (while waiting for Evanescence)
The Smashing Pumpkins
Lamb of God
From Autumn to Ashes
Killswitch Engage
Machine Head (x3)
Meat Loaf
Scott Stapp
Queen + Paul Rodgers
Doro Pesch
Arch Enemy
Holy Moses
Leaves Eyes
Tarja Turunen (ex- Nightwish)
Warlock
Bobby "Blitz" Ellsworth (Overkill)
Chris Boltendahl (Grave Digger)
Axel Rudi Pell
Klaus Meine + Rudolf Schenker (Scorpions)
Girlschool
Overkill
The Answer (x2)
The Sword (x2)
Upcoming concerts:
June 5-June 7: Rock im Park Festival (Nurnberg)
July 3 - Bruce Springsteen The E Street Band
July 4 - Metallica, Anthrax, Lamb of God, Mastadon, Die Toten Hosen, In Extremo, Down (Sonisphere Festival)