very cool, thank you for pointing this out. I want to play with it some more, but I think one of the things that isnt fully thought out is that some url's will

very cool, thank you for pointing this out. I want to play with it some more, but I think one of the things that isnt fully thought out is that some url's will inherently change over time - the front page of the NYT for instance shows comments from over a year ago that obviously don't apply now - even comments from an hour ago may reference content that is no longer there. I don't have an answer for the problem but its something thats got to be thought about. Similar problem would be canonicalization of urls.