Excerpted from the article:
Strategy #1: Try to Get Permission
Seriously consider offering something in exchange for a visitor's email address. It can be a free trial, a free report, or maybe even a free book. But gaining the means and permission to contact that customer again will increase your conversion rate over time in most cases. There is great power in an email list.
Strategy #2: Use Advertising to Test
Use advertising as a testing tool rather than a long-term stream of customers. Very few startups can withstand the cash outlay required to turn advertising into a marketing activity with positive ROI. Even if you figure it out, advertising is a volatile marketing medium. Prices increase rapidly in online advertising as new competition crops up or prospects grow bored of your ad and your click through rate drops. When this happens, all of the time you invested in optimizing your ad campaign is *poof*...gone. So instead of relying on ad traffic as an ongoing stream, use it for what it's best at: the ability to generate a slew of visitors very quickly, and to be turned off just as quickly.
Via Gaurav Pandey