I'm aware of some quite big companies that are using CVS...
Air France (> 1000 coders) uses CVS for projects upto 15/20 members
(larger teams use ClearCase but I'm not convinced of the added value)
W3C (the world wide web consortium that is in charge of HTTP HTML XML ... ) also
uses CVS in a quite instensive way.
Amadeus (> 500 coders)
That's three more on your list ;)
But keep in mind that CVS has a poor integration in the Windows World (no scci
support) and is not very well suited for binary format files (that are the most
common in the MS realm)
This is a very good tool for source control... but it is not so good at more
general tasks...
Olivier