indeed too many to list, but some of my fav's not already mentioned that come to mind are:
Duane Allman on Boz Scagg's "Loan Me a Dime"; and Scagg's rythm on the same is perfect.
Andy Latimer of Camel - "Ice" (several other Latimer solo's are also up there)
David Gilmour - "Comfortably Numb" - especially the version on "Pulse" DVD.
Steve Hackett - "Supper's Ready", and others