Using posterous.com to track URIs. Here's an Ancient Mediterranean object at the National Museum of Natural History.
If you're reading this at http://mediterraneanceramics.blogspot.com/ , that's part of the experiment as well.
If a character in a URL can change, it will.I'm not the only person to think this but I just wanted to get that thought out in simple, direct language.
If a URL looks unstable, it is.