Last April, children's author Janet Wong wrote about her adventures as she released two Kindle books. A few days later Janie Bynum and Laura Ruby collaborated on Judging an ebook by its cover, which goes into detail about the process of designing an eye-catching cover.
It turns out that Once Upon a Tiger won the nonfiction cover award for September given by The Book Designer blog. Congrats to the artist, Sladjana Vasic!
There is an interesting series on the Password Incorrect blog called Ebook Specific Cover Design…here is Part 1: Context.