Share '.99, 2.99 or Higher: The Pricing of an E-Book'

I know there is lot of controversy about this, but I wanted to open up a discussion about e-book pricing. However, with the success of Darcie Chan, who sold 400,00 copies after she lowered her price to .99 cents, I wanted to see what success or failure anyone else has had. What is the price of your e book? Why did you choose that price? Have you ever raised it or dropped it? What was the result?