Over the past 10 years, the biggest problem that I've
seen with most viral tools I've studied, is that they
fizzle before they really reach critical mass. Once a
viral tool reaches a certain "velocity," then it will
continue spreading. If it never reaches that critical
velocity... where enough people are passing it along,
then it "technically" was never viral.

Of all the viral tools that I've studied and dissected,
the easiest to create and most successful one that I've
personally used is the rebrandable PDF. Let's look at
what makes that such a powerful tool!

First of all, people need a reason to pass something
along and send it viral. One of the best reasons they
can be given for doing this is that it will make them
money. When you create your PDF files, you simply set up
certain links so that they can be changed to other links
that pay the recipient money when they passes the PDF's
along.

As someone who sells several dozen products through
my own affiliate programs, I have found this to be the
perfect tool. When I write ebooks, or special reports,
I often give them away (or sell them very cheaply)
with reprint or redistribution rights. Then I give
the buyers or recipients permission to rebrand certain
links in the PDF's, changing those links to THEIR
affiliate links.