Best concert/gig you've gone to...

Mine was Tenacious D in the Birmingham NEC in 2006.

It was the POD tour, after the film came out.

Quite possibly the best thing i've ever seen ... ever ...

I really couldnt say what my favourite was but some of my favourites are

Reel Big Fish at the Forum
Dragonforce at the camden Barfly
Slipknot at the Astoria
System of a Down at the Astoria
FFAF at Subterrania (like 5 years ago)
The Whole of Download 07
Skindred in the Astoria / Mean Fiddler
Offspring at a random TV recording
Foo Fighters at Hyde Park

My favoritts of the ones ive been to are:
Deep Purple
Iron Maiden (Early days tour with Mastodon and A Matter of life and death Tour with Trivium )
All of wacken 2007 (specially In Flames, Municipal waste, All That Remains And Lacuna Coil)
Paul Di'Anno
Robert Plant and Allison Kraus (as im a huge Led Zepp fan)
Judas Priest
Turbonegro
Trivium (with sanctity(whos bassist gave me 45 norwegian kroners for either a haircut or new shoelaces) Annihilator as opening acts).