9e9an.com allows you to stream your favorite videos from YouTube, Google Video or any other RealPlayer, MP3, or other video extensions.
For YouTube, in the top of the message editor, there is a button for YouTube. Click on it, it will insert to you the a tag. Then, go to the web page of the video that you want to post. It should have a URL that look like:
http://youtube.com/watch?v=Re5zcT9FNngCopy what is after "/watch?v=", that is "Re5zcT9FNng", and place it in the middle YouTube Tag. And once you post the message it will be like this:
And you are done