Ok, so I have done a few viral marketing campaigns over my career. One that many people don't know was even me is
www.savemyfinger.com.
I really just did this on a bet to see how much traffic I could drive in a short amount of time. It was actually crazy how many hits came in the first week I put this out. The whole story is on the site, so I won't repeat it.
But if you are looking for tons of quick backlinks and immediate traffic, you should start thinking about viral marketing. The value of a solid viral marketing campaign cannot be under estimated.