Things I learned from doing a three day free promo on Amazon:

1.  One day is long enough.  I got most of my traffic the first day.  By the second day downloads had dropped to less than half, and on the third day downloads were half of that.

2.   Give yourself enough time to market your free days.  The Author Marketing Club has a great list of sites that list free promos.  Click for the Book Submission Tool.  I listed my promo only on these sites, and got a goo...