expialidocio.us is a neat visualization of one's del.icio.us tags. Cooked up by Oliver Steele, using OpenLaszlo, the widget let's interact with a sliding temporal window over your del.icio.us tags. A tag cloud is generated from the bookmarks that fall within the window.
A nice prototype (?) that leads the mind in various directions. The tag cloud takes up a lot of real estate, and it could be put to more use. For example, if I hover over a tag the slices of the timeline that cover that tag could be highlighted. Also, I might provide some chunking in the timeline, so I could discern patterns in bookmarking behavior. Maybe I'm a regular midweek poster or can identify increased usage close to some major life event.
Good stuff though!!