I run a sram 9 speed cassette on a bike with campy 9 speed (second generation) shifters and derailleurs. I have friends that run this same setup with the first generation ergos. It shifts better than the bike I have set up with 6500/7700 parts. It works. Well. Mr. Jet Sanchez has run this before as well, he can back me up on this.
I also picked up a NOS 13-26 mavic cassette with swappable spacers for both shimano and campy shifting, but I haven't mounted it yet. It's not ramped, and it's still NOS so I've been holding out for some reason.
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Shimano : Click :: Campy : Snap :: SRAM : Bang