I got back from Sonisphere UK today.
I saw in this order:
Blaas of Glory (they're amazing, seriously, youtube them now)
Delain (like nightwish but better)
Turisas (insane mosh pits)
Alice Cooper
Family Force 5 (hilarious and really good live)
Sabaton
Soulfly (insane mosh pit)
Anthrax
Fear Factory (more insane mosh pits)
Good Charlotte (played their good stuff)
Apocalyptica (shredding a cello... amazing)
Papa Roach (played most of their good stuff)
Bleed From Within (tiny unknown band with insane mosh pit)
Motley Crue
Rammestein (absolutely huge mosh pit and the lead singer crowd surfed in a boat)
CKY (96 quite bitter beings, nuff said)
Skindred (if you don't know who these are go find out now... I'll wait... amazing live band)
Slayer
Pendulum (better that I expected)
Iron Maiden (didnt play run to the hills ): but did play number of the beast

)
Anyone else at Sonisphere? Or any similarly amazing festivals recently?