Mines not thaaaat impressive really
1996
Five
2004
Nelly Furtado, Sugababes, McFly, Natasha Bedingfield, Busted, The Calling, Lionel Richie, Blue, Darren Hayes, Lemar..and some other random people I can't remember (But they were all at various festivals and things)
2005
Natalie Imbruglia
(And a few more random people)
2006
Kelly Clarkson
Lily Allen x2
Scissor Sisters x3
2007
So Far:
Nelly Furtado
Lily Allen
Upcoming:
MIKA - May
Scissor Sisters - July
Red Hot Chili Peppers - August
Gwen Stefani - September
My memory's not very good though so I've probably missed a lot out