What I'd like to see is a Touchpad homebrew app that picks the first book in your Kindle folder and exchange it with the mobi/azw file of the users choosing. It would rename the file to whatever azw file kindle is using. It doesn't have to have a fancy gui, it should just be able to let you open your own mobi file in the kindle app.

Bonus points if it links the cover art as well. It'd be crazy insane if it let you sync the book and cover directly from Calibre.

But really, just a simple kindle azw - mobi/azw swap app would be much appreciated by a lot of people. I know I'd donate $10-20 for it!