I think that the more important question than how to get traffic is "What are you going to do with that traffic once they come?".

And, strangely enough, more people wonder how to get more traffic and worry about all kind of different tricks and gimmicks than worry about servicing that traffic once it gets here.

What is the purpose of your website?  What is your conversion rate from viewer to opt-in to sale to backend sale?  Did you know that if you could tweak each of those steps just a bit, you could double the amount of money that you make with the same traffic you are already getting?  It's true.  If you could push your visitor to opt-in conversion rate from 40% to 50% and your opt-in to sale conversion rate from 25% to 35% then for every 100 visitors you go from (100 x 40% x 25% = 10) 10% visitor to sale conversion to (100 x 50% x 35% =  17.5%) 17.5% visitor to sale conversion.  You just increased your sales by 75%.

The more steps in your sales process, the bigger difference this will have to your final result.  If you would just leave your conversions alone, you would have to increase your traffic by 75% in order to increase your sales by 75% and that can get expensive.  First, work on your conversions and aim to increase each step of the sales process just a little bit.  It adds up very quickly and soon you will find yourself making more money with the same amount of traffic instead of worrying about getting more traffic.  Once you have this streamlined, then go out and get more traffic.  You will be rewarded many times over!