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@jsabine
They come with an 8-speed freehub, so you can't just put a 9-speed cassette on. http://www.campyonly.com/phpBB3/viewtopic.php?f=2&t=2124 suggests that you can change the freehub (assuming you can get the part) but that it's not recommended.
If you want to try just running an 8-speed cassette with 9-speed mech and shifters, there's a difference in mech travel of just under 0.5mm per gear, so your indexing would be about 2mm out at each end of the cassette - I'd say this would run quite rough. You might be able to tweak the cable routing at the mech slightly to change the amount of movement per click of the shifter (lots of detail about cable pull, cassette spacing, and using Campag and Shimano together at http://www.ctc.org.uk/cyclists-library/components/transmission-gears/derailleur-gears/shimergo), but to be honest I think it's probably more hassle than it's worth trying to get it to work.