A few concerts which totally blew me away;
In Flames opening up for Iron Maiden @ Ullevi stadium 2005 (needless to say, the Iron Maiden performance was solid too)
Behemoth at Sweden Rock Festival 2005!!! Brutalllll kickass ownage! I had never heard of the band before then, now I'm a big fan!
Engel (Engel Propaganda at the time?) at Metaltown 2006, Before they released their first album and somewhat ruined the songs :S
Strapping Young Lad @ Hultsfred 2006, Could be the most awesome thing I ever witnessed, sadly I was quite "influenced" at the time, damn festivals. Also their last tour before breaking up
Opeth @ Hultsfred 2006, also some kickass shit. It's just sad that their setlists are so short at festivals, since their songs are so long.
Satyricon @ Metaltown 2006 was also a really nice performance.
Vader live @ Musikens hus (house of music) november 2006 in Gothenburg. Plus points because the venue was really small and it was a really tight performance. Neat!!!!
And lastly, but not least;
X Japan @ Tokyo Dome March 28 and 30th of 2008. I bet you all know why these shows were so orgasmic. 29th wasn't just as good as the other two ones according to me though.
Worst: Ektomorf opening up for Children Of Bodom early feb 2006 or Dimmu Borgir @ gates of metal 2005. Ektomorf was just.. "FUCKING YOYO MAN FUCKING YEAH MAN YEAH" and Dimmu Borgir had totally messed up sound. Could only hear drums and bass.