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I'm really surprised no one responded to this one, as it's something all of you domain speculators should be jumping on, and doing so loudly.
Dynamic DNS allows broadband internet users to identify their domain name with a dynamic IP. Since most ISPs allocate dynamic IPs to home users, these subscribers are otherwise inhibited from establishing their own domains. With DDNS, users can register their domain and associated with a server on their own network (say, a WinXP box running IIS) in spite of the fact that their IP will change periodically.
Originally we used to roll our own DDNS services using bind and nsupdate, but today anyone can subscribe to a DDNS service provider. And the best bit is--it's usually FREE! The DDNS provider then updates the A records, MX records, and CNAME records to your new IP every time it changes, snap!
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