A little late to this party but: +1 @unreceiveddogma, @bishop148 and some others - when I have Pink Floyd in heavy rotation it will be pre-Dark Side 6 days out of 7. I love the greater variety of musical styles in the early stuff and the shorter pieces that populated many of those albums. While I still enjoy their later works, especially the sonics, to me there seems to be an increasing tendency toward bombast.
and @drbb, thanks much for the great concert link - I hadn't run across that one.