I was on Twitter today and one of the people I follow, Cyprien Lomas, had put up a video "tweet", which intrigued me so I had to figure out how you do it. Here, below, is a link to an article about video tweets which will point you to a couple of sites that allow you to use your Twitter account to log on and create/upload a video tweet. You can also record a video on your computer using something like MS Movie Maker and upload the video file.
http://www.webpronews.com/topnews/2009/05/29/easier-than-ever-to-video-tweet
