Best live album you've ever heard?

Peter Gabriel’s Secret World Live. Great performance and very dynamic recording.

I agree with all those folks who think Little Feat’s Waiting for Columbus is an outstanding performance. I seem to remember reading about that album on Little Feats official web page. It seems Lowell George over dubbed some of the songs. That’s way the album never was nominated for a Grammy in the Live Performance category.

Oh come on, this is an easy question:
Gentle Giant: Official live Playing the Fool

I have to admit I was a bit irritated when I saw Shudson653 beat me to the answer!!!!

Jazz at the Pawnshop

In addition to some of the above:

Lou Reed Rock N' Roll Animal - Great blazing guitars. A great opening blast of twin guitars. Live, decadent, fantastic.

Jackson Browne - Running On Empty - Drums mixed second to Jackson's voice. All new material on a live album. David Lindley on board so great instrumentals and a great band.

Guns N Roses - GNR Live - I am not a big GNR fan but this has great sound and I finally understand why the band was so popular.

The Band - Rock of Ages Live on New Year's Eve. The first reissue on CD sucked. 3 horns including tuba player joining them. Allen Toussaint did the horns. Great version of chest fever. The LP was magical, can't speak as to any reissues since then.

Genesis 1967 - 1975 Boxed Set with Lamb performed live on 2 cd's and also some earlier performances. Accomplished musicianship at the top of their game. Right before Gabriel left the band.

I am sure I will think of more, but this is a start.

Johnny Winter And Live is the best Trich727 you are right.

Also thank you to Elgordo for Bravo Brubeck, the day I read this post I was at the music store and found Bravo Brubeck (vinyl used $3) and it is really tasty (I am listening now) Good Call!