Do you know how to drive traffic? Not many people do where you actually make an ROI, but it definitely can be done.  You have find the right campaigns that will convert for your product and bring in revenue and/or leads.  Obviously, search engines are a great way to drive traffic to your site.  Using keyword tools to find search terms is critical to grabbing the most traffic out there.  Use Google and Overture for the pay-per-click campaigns you want to run. Start your bids out low and raise them up later once you see the conversions.  I do not recommend any other "tier-2" search engines, but deliver crappy traffic.  Another tactic is to build out websites that can get traffic and to start and affiliate program to drive in traffic.