Platonides wrote:
Are you suggesting easy changing of URLs?? You shall be condemned to sort the web for the rest of your days!! http://www.w3.org/Provider/Style/URI
If we were living in a perfect world, I agree that changing an URL would a bad, bad idea. But here, back to the real life, things are not that simple.
I have a friend that asked me to solve this very same problem on his company's subversion server. They moved their domain name from "hiscompanyname.com.br" to "histrademark.com", mainly because the new domain name was cheaper, shorter, easier to memorize and had a bigger commercial appeal. Unfortunately, their internal subversion server stored a lot of "intranet.hiscompanyname.com.br/tracker/..." URLs.
In Wikipedia we have the same problem. Just to cite one example, on the very early days, http://en.wikipedia.org/wiki/Java used to be the Wikipedia's article about the programming language. Then as time passed, it became a disambiguation page, and today it is an article about an island. The URL is the same, while its contents are completely different.