Thanks to all who gave me advice on trying to get the NFS server up and 
running on my NetBSD machine. You definitely helped! But up until last 
night, I still was not able to get my OS X machine to talk NFS to NetBSD. 
But when I was just about ready to download NFSManager, I found the 
following webpage...
http://www.funkyres.com/documentation/nfs.php
I think the instructions on the webpage are doing exactly what NFSManager 
would have done automatically. I just don't need to pay for anything (I 
know, its only $15 :-). The only downside is that you need to reboot the 
OS X machine in order to bring the share up. I'm betting there is a way 
around that, I just haven't taken time to figure that out yet. I hope 
this page may help someone else who's having problems.

Thanks again for everyone's help,

Brian