The FAQs I've seen all point to using CIFS, but does anyone happen to know if a way exists to actually add smbmount and smbfs to fc5 in a way that would let someone smbmount a share?

Yep build the binary rpm packages from the samba.org source: http://samba.org

One needs to use the redhat/fedora spec file and copy some files after extracting/installing the src.rpm file.

This stuff gets used, you have to unpack the samba-3.0.25c.tar.bz2 to have access to them;

The files in the /SOURCES/samba-3.0.25c/packaging/RHEL/setup files replaces the setup.tar.bz2 in the /SOURCE directory. One has to create the file tar.bz2 file from this dirctory, hint: right-click on the directory

The file in the SOURCES/samba-3.0.25c/packaging/RHEL/samba.spec directory replaces the /SPECS/samba.spec file.

When done type from the /SPECS directory location: rpmbuild -ba samba.spec
The rpm-build package needs to be installed for this to work. Depending on how you build the rpm packages (as root or otherwise) the /SPECS and /SOURCES locations could be;

(as root) /usr/src/redhat
(as non-root) /home/<username here>/rpmbuild

One also needs to rebuild the kernel and add back the missing smbfs support.

Good luck.

I'm gonna need all the luck I can get to do that, but thanks for the info. It should help.

Edit: Apparently this method has a drawback in that, Yellow Dog Linux is not really Fedora Core. It sorta kinda is (whatever that means), but it's also its own beast.

The same thing stll applies, add back the kernel support for smbfs and build the binary packages from samba.org.