Ok bands/acts i've seen live are:

Nirvana (Reading '92)
Smashing Pumpkins (Reading '92)
Manic Street Preachers x2 (Reading '92 and Glastonbury '94)
Public Enemy (Reading '92)
The Wonderstuff (Reading '92)
The Charlatans (Reading '92)
Beastie Boys x2 (Reading '92 and Glastonbury '94)
Rage Against The Machine (Glastonbury '94)
Plus others too many to mention.

Non-festival concerts
Minus the bear
Alice in Chains
Bloc Party
The Vines
Delays
Thrice
Arcade Fire
Kanye West
Jay Z
Linkin Park
ENter Shikari
N.E.R.D.
Oasis
Cast
Charlatans
Kula Shaker
Stereophincs
Coldplay
Brand New
Guns N Roses
Machines Of Loving Grace
Blur
The Killers
The Academy Is...
Head Automatica
Arctic Monkeys
The Last Shadow Puppets
The Smiths
Circa Survive
Fall Of Troy
Cajan Dance Party
Kaiser Chiefs
Red Hot Chilli Peppers
Kings Of Leon
Blink 182
Green Day
The Offspring
The Wildhearts
Shelter
C.I.V.
NOFX
Bad Religion
Foo Fighters
U2
Tears For Fears
The Libertines
Gas Light Anthem


Probably some lesser know bands to at local gigs.

Erm bands I would love to have seen live:

Lynyrd Skynyrd
The Who
Led Zepplin
The Doors
The Beatles
Bob Dylan
Hendrix

erm thats all i can think of at the moment.