Quite an interesting point, thanks for bringing it up. I'd say most domain extensions other than .com, .net, .org (and .edu, .mil, .gov) would fall under eithe

Quite an interesting point, thanks for bringing it up. I'd say most domain extensions other than .com, .net, .org (and .edu, .mil, .gov) would fall under either ccTLD (country-code TLDs) or vanity domain categories. If memory serves me right, the first creative use of such a domain that achieved good visibility and large-scale commercial success was del.icio.us, or am I missing any others before that?