There's an interesting proposal for a 'duri' URI scheme, that means "what this URI was at this date": http://tools.ietf.org/id/draft-masinter-dated-uri-07.html

There's an interesting proposal for a 'duri' URI scheme, that means "what this URI was at this date": http://tools.ietf.org/id/draft-masinter-dated-uri-07.html http://tools.ietf.org/id/draft-masinter-dated-uri-07.html It doesn't actually freeze the contents... but it provides a language/key for talking about permanent URI+content bindings.