Signature files are little blurbs of text either after a post in a message board or at the bottom of your email. The most notable use of a signature file would have to be
Hotmail.com Hotmail originally relied on it's own customers to promote their service as
each email message they sent contained a direct link to Hotmail's sign-up website.
This viral marketing strategy generated hundreds of thousands, very possibly millions of new users for their free service.
The idea of signature files is to make them as short and as compelling as possible. Let's say I just finished writing a post to a message board and I was just talking about affiliate programs.
This is what I write after my message board post to advertise my website.
"Discover How To Generate Thousands Without A Web Site Or A Product Of Your Own"
And I would link that to my sales page. A good idea is to also use a separate tracking system to track how many hits your message board postings are receiving. I talk about this more in "Tracking Your Way To Success"
If you were answering a question on creating a well written sales letter, you could use your signature file to promote an affiliate program like InstantSalesLetters.com. It's that simple.
You can get the get the FREE complete step-by-step digital book on how to generate cash & traffic using articles with Adsense and affiliate programs here (Private Membership Reg Code "MAMBO"):