i've been to see:

BLUE - they were fantastic it was great and lee pulled a moonie.
WESTLIFE - they were good too, not as good as blue though
CRAIG DAVID - he has a great voice but it wern't that good
BOYZONE - brilliant and we had a laugh there. we took big bottles of coke with vodka in them so we were rotten.
TAKE THAT - I was only young so i can't remember that much. it was good though.
FEEL THE NOISE IN LIVERPOOL - it was various singers including blue, will young, liberty x and loads more