I've always loved this tune, and I can pretty much play this entire album (as well as John Barleycorn) in my head. Great to hear this live version. It's great how both Winwood and Wood really stretch out, going outside the chord changes at times. This kind of exploration (along with great compositions and great performances!) is what made me love Traffic, and I love them still.
I remember playing the title track from Low Spark for my mom, knowing she'd appreciate the blues & jazz aspects -- sure enough, she did, since she was always very open musically...although the lyrics puzzled her and made her worry a bit about just what the hell her young son was getting into. Just super cool music, as it turned out. 
Interesting analyses on the meaning of the lyrics here:
http://answers.google.com/answers/threadview?id=336165
How about this nice medley of "Glad" and "Freedom Rider" from a few years later?
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