This is an excellent example of how to create a viral video. It was posted March 20, 2008 and it already has 84,071 views. He also has some more internet marketing related rap videos on his YouTube channel.
If you’re trying to create a viral video you should consider how you can make it entertaining – if you analyze some of the most popular videos you’ll see that many of them have at least some entertainment value. Think about “What would make people watch this?”.
Oh, by the way – did you see the new Gmail feature that Google announced? It could come in handy to be able to make your mail appear to have been sent earlier – even mark it as people had read it ;)