E-mail marketing is one of the most cost-effective ways of marketing and generating traffic to your site.
One company received 140% response rate with an e-mail broadcast. When I first heard this, I thought is was a typo. After all, even if every one who received the e-mail responded, that would only be 100%, right?
The e-mail was so compelling and the product was so interesting that the people who originally received the e-mail forwarded it on to other people they felt would be interested, so the reach of e-mail extended beyond the original list to include friends and colleagues in their address book.
An interesting illustration of the power of people telling others.