Seth Godin's daily blog post was particularly good today. He talks about the relationship (or lack thereof) between price and satisfaction and includes this nugget about being sure you charge enough:
"Price is unrelated (in creating satisfaction), except for one thing: Charge enough that you can afford to actually keep your promise. The thrill of a low price disappears quickly, but the pain of a broken promise lasts a very long time."
I highly recommend taking 60 seconds to read the whole post.