Chris Brogan - always on the cutting edge - showed me a new social media tool: Seesmic.
It allows you to do a video conversation, like twitter with your webcam. In other words, it's not like video-chatting - where you talk with each other with the video component added - but rather the conversation is out there for the world to see. And add to. (Like a blog.)
The site is kind of unpolished, like how the header is your browser's name and the logo does not link back to the home page. But it will be interesting to see where it goes!
Best I could figure, Seesmic has been around for about 9 months.
Update: Viddler is another site like Seesmic. See my trial here. Its improvement over Seesmic is that you can comment along the video's timeline.