[CentOS] NFS Exporting / not working ???

I'm fairly certain I'm not losing my mind, but....

I'm a very recent convert from fedora 7 to Centos 5.  I had the /
filesystem exported and it worked fine.  Installed Centos, dropped the
very same exports file I was using successfully into /etc, restarted
nfs, and it won't allow anyone to access.  If you mount it from a
different system, the mount succeeds, but no files or directories show
up and the ls just sort of dies a slow death.

I managed to get it to work with samba, but nfs just won't happen.
What am I missing?

Mike-
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