Call me skeptical, but I don’t see this taking off. While the Internet Archive requires no input from site owners themselves, and at times, while a useful resource, is more often used as a curiosity, I can’t see web site owners willingly filing away older versions of their spanky new web site, just so that some interested Future Joe might fancy seeing what their site looked like in 2009. I also can’t see many service providers accommodating the required server updates for free. It’s an interesting idea, but nothing that the Internet Archive doesn’t do effectively enough on it’s own already. Who knows, they could prove me wrong, but for now, I don’t really need to visit any older version of a web site enough to require this service. I also wonder, as it makes use of the date and time element of the HTTP request, whether this is something that Google will be considering as part of their SPDY research project, and will it remain part of the protocol. Only time (no pun intended) will tell.