While this may be old news to some, I am sure that many Marketingbosses have not yet seen the fantastic viral marketing videoseries named "The Meatrix". You really want to see this. There are a number of good viral marketing instruments out there, however, in my opinion, nothing beats this.

Links to the Meatrix videos here:

The first Meatrix video: http://www.themeatrix1.com
The second Meatrix video: http://www.themeatrix2.com/
And more: http://www.moremeatrix.com/