I was more curious than anything, so I whipped up this list. Bold are headline acts, the rest are supports.

2005

Franz Ferdinand
The Editors
The Rakes

2006

We Are Scientists
The Cinematics
Foreign Born

The Rakes
Sean Na Na
The Klaxons [Before they were famous, I thought they were shit]

The Zutons
The Rumble Strips

Red Hot Chili Peppers
!!! [Chk Chk Chk]

Ben & Jerry's Sundae On The Common [festival]
Jose Gonzales
The Wonderstuff
Captain
Vincent Vincent & The Villains

Carling Weekend Reading 2006 [festival]
Friday
Franz Ferdinand
Kaiser Chiefs
Yeah Yeah Yeahs
Mystery Jets
The Subways
Gogol Bordello
Saturday
Muse
Arctic Monkeys
The Streets
Dirty Pretty Things
The Futureheads
The Cribs
Wolfmother
Sunday
Maximo Park
The Rakes
The Kooks
Boy Kill Boy
Broken Social Scene
Goldie Lookin Chain
Hope Of The State
The Dresden Dolls
¡Forward Russia!
Tapes 'n' Tapes
Metric
The Marshalls

The Automatic
The Alterkicks

We Are Scientists
Hot Club De Paris
Au Revoir Simone

XFM Winter Wonderland [festival]
Kasabian
Tenacious D
The Kooks
The Feeling
The Automatic
Boy Kill Boy
Just Jack

Tenacious D

2007

Muse
The Streets
Dirty Pretty Things
Rodrigo Y Gabriella

Carling Reading Weekend 2007 [festival]
Friday
Ash
Kings Of Leon
Interpol
Get Cape. Wear Cape. Fly.
The Enemy
Gogol Bordello
The Long Blondes
Little Man Tate
The Pipettes
Saturday
Red Hot Chili Peppers
Arcade Fire
Bloc Party
The Pigeon Detectives
The Young Knives
Good Shoes
The Noisettes
Sunday
Klaxons
LCD Soundsystem
CSS
Jamie T
Devendra Bernhart
The Cold War Kids
The Maccabees
The Sunshine Underground
Pull Tiger Tail
Late Of The Pier

The Maccabees
Derek Meins
Kid Harpoon
Talk Taxis

Bloc Party [with Exmoor Choir]
Maps

We Are Scientists
The Cinematics
Kid Harpoon

Good Shoes
Operator Please
Ida Maria

Bill Bailey

Kaiser Chiefs
The Pigeon Detectives
Joe Lean & The Jing Jang Jong

Art Brut
A-Human

2008

NME Big Gig 2008
Manic Street Preachers
Bloc Party
Kaiser Chiefs
Klaxons
The Cribs

Reel Big Fish
Streetlight Manifesto
Sonic Boom Six

Radiohead

V Festival
Sunday
Muse
Stereophonics
The Kooks
Maximo Park

Reading Festival
Friday
Rage Against The Machine
Dan Le Sac vs Scroobius Pip
Does It Offend You, Yeah?
Queens of the Stone Age
The Fratellis
Get Cape. Wear Cape. Fly
Anti-Flag
Saturday
The Killers
Bloc Party
The Raconteurs
Editors
We Are Scientists
Mystery Jets
We Are Scientists acoustic set
Bombay Bicycle Club
Sunday
Metallica
Tenacious D
Feeder
Mindless Self Indulgence
Hadouken
Cajun Dance Party

Mystery Jets
Golden Silvers

The Futureheads
Johnny Foreigner

The Futureheads

TV on the Radio

---FUTURE---
Bloc Party

Franz Ferdinand

Bloc Party
Foals