Tag cloud in time.

As showed polls on Habré, the tag cloud is not perceived as an element of navigation. Only as an element of statistics (Although when I first got on Habr, I used the tag cloud for its intended purpose for a couple of hours :). So, if we consider it as statistics, then why not add such a factor as time to it? That is, when forming a tag cloud, take into account the time of publication of articles - the older the article, the less “weight” its tags have when calculating . Thus, it will be clear what is relevant at the moment. In addition, you can make a time machine on a separate page :). That is, you choose the date and get the tag cloud that it was at that moment.