Dynamic DNS

Time for me to poke at dynamic DNS services. I run an SSH server for remote access to my home box. Usually my IP address stays fixed, but every now and then it changes when I reboot the gateway box. Just often enough to be annoying, not often enough to force me to fix it. I need to research dynamic DNS services and find one that'll provide me a cheap single name, and see if there's any that'll provide me with multiple names in a domain I own. That way I can tie the dynamic-DNS update software into my network scripts and get instant updates when things change.