I finally decided I wanted an nfs server. But for the life of me I could not get it to work. Even went through all the trouble of getting cbxbiker61's custom kernel and still NOTHING.
There's something wrong with my init.d script (at least there is with mine). I have no idea why apt-get wasn't installing the latest version, but it kept the old one.
It relates to http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550153
If you get the error than nfs server isn't in the kernel, what you need to do is check your init script. There's a place where it greps /proc/kallsyms, and the grep was wrong, causing it to fail.
A simple solution is to delete the init.d script, and do an apt-get install --reinstall nfs-kernel-server and you should be all good.
Or if you're 100% sure that it's compiled (check the .config) then just comment out the lines where it throws the error.