The N*E*R*D remix of "Sympathy Of The Devil" when everything else drops out and an acoustic guitar starts playing a completely different tune on the "Every Cop Is A Criminal" part. It's the most beautiful moment in any recent release, because it's so unexpected and sounds so brilliant. If you haven't heard it, d/l it now.
Also, Slash's first guitar solo in Estranged. His finest work.
And the "look out, look out, look out, look out" bit on Leader Of The Pack. Superb.