Multi user network share and resource forks
I've never used NFS for real file shares, but a friend recommended NFSManager for enabling NFS options on your Mac clients.

You could also try building netatalk to enable a native AFP share on the Linux server, which would certainly make your CS users much happier.  Adobe doesn't officially support opening and saving files over any network sharing protocols, although my users seem to have no problem when using Bridge to open directly off an OS X Server afp volume.