I have seen the application that is almost same with My Kindle Wallpaper at
But the application on those websites is PAID app : you have to pay before download and using.
Just want to tell you that the application on those sites is not belong and related to My Kindle Wallpaper .
My Kindle Wallpaper is FREE and you can download only from this site.
UPDATE – 9 February 2012
The application on those websites is changed from paid app to free app already.