well mostly i think not.

you should have a product, lets say an ebook,
then a free report which includes good valuable info in it.

you give the free report to those who visit your product page and try to get their email
in return to the free report.

the free report should be branded for those who wants it.
since the free report will promote the product you will want people to brand the report and spread it around like viral marketing since they know they get commision on a product sale since the client came from them.