I finally got Leopard to mount my home server. Never had any problems with Tiger across multiple machines, but Leopard didn't work. All I want to do is mount the volume...

I could connect directly, so I knew everything was accessible:

smbclient //1.2.3.4/public

Anyway, here's the magic that worked for me, from Terminal:

mkdir /Volumes/public
mount -t smbfs //1.2.3.4/public /Volumes/public
open /Volumes/public

The mount prompts for password, you can specify a different user if you need, too.