I remember some web services that would basically delete your account after a year of inactivity or so , like your Diablo account. I really wish domain names would be the same. Actually, anything isomorphic (like twitter handles) should be the same.

Define "inactivity". No DNS records? Because if I simply have an MX record, I could be receiving tons of emails without displaying any activity. Domains aren't just for websites.

Previously on HN: The Hipster Domain Finder http://www.hipsterdomainfinder.com/

Just a reminder: these sort of domain hacks are subject to the whims of that ccTLD's country, e.x. Libya in the case of .ly

Then you just have a crappy extension instead.