Few memorable ones:
Queens of the Stone Age in San Diego at the height of their powers about 10 years ago.
DJ Shadow at Brixton Academy about the same time.
Plus although they are a band that I wouldn't normally listen to, I saw Elbow at Wembley about 2 years ago, fantastic live, he is a brilliant front-man, cracking voice and they sound very tight, but still sound like they are enjoying themselves.
Saw Kasabian at some festival (V Festival i think), although i like them as a band, they were rubbish, he couldn't sing for toffee and the sound was rubbish, big disappointment.