I have begun the price pulsing technique outlined in the book "Let's Get Visible". The idea is to make your book that you are promoting very low priced. This helps to get sales but you don't make much on your royalties at 99 cents. However you are giving up profit for exposure. Increased sales drives your book up in the rankings and so you get higher up in search results within your genre. Once you are higher up your sales should increase more moving you even higher. Once this happens you must try to calculate the exact right time to increase your price. Hopefully you do so at the peak in your rankings with lots of good reviews and now you have increased your book price to lets say 2.99. So now your sales start to slump a little do to the price increase but your making a nice profit margin in the mean time. Again you must strategically know when to decrease the price back down. The ideal time is when your book ranking has been slipping down for a few weeks but still selling some. It will take a few cycles of this to get the hang of it but anyway that's the general idea.