Webcams. They've been around for a few years, and solidus full-stop had a slashbox dedicated to one of them. Netscape has the Amazing Fish Cam. And there are plenty cams out there. Earthcam and world wide cam came up easily in google.
Every once in a while i come accross one and keep looking at it to see what might be interesting. There's the one on the Western Wall showing people visiting the site, there's a kitchen cam staring at someones kitchen table, offices and other items that change slowly.
While i do like checking them, i think it is pretty rare. I don't even always know why i am checking. That, of course, gets me to wonder about having my own cam.
Hmm.. just a passing thought.