I was going to say that I hate all live albums, but some of you have named some good ones.
Generally, the recording quality is so bad that I just can't take it. The ones recorded in small rooms or studios (like the unplugged albums) are good though.
Another good one : Willie Nelson and Johnny Cash Storytellers (from the VH1 series).
Also, the new Wu Tang live album (capturing the last concert the original members will ever play together) is full of energy and fun (but of course sounds horrible).
Also, Cheap Trick Live at Budokon.
RuthieB, I love that Tesla Five Man Acoustical Jam album. Most people say that nothing good came out of the hair bands, but that one is a gem.