Fully Qualified Domain Name
This is not so much as a problem, just a curiosity.
I've often seen the error that my hostname is not a fully qualified domain name. During the installation of Mandrake 10 it even gives me an example of a good hostname followed by ".com".
What if I'm not a ".com"? I don't want my hostname to be something.com! Is there a proper way to have a name like "foo" that isn't followed by a top-level-domain?