I recently discovered Readmill, a social ebook reader for the iPad, and have been enjoying using it. Readmill also has an API and I built a simple web app to show the locations where you've been reading books on a world map, called Readmap. I had fun building it and now it's been featured in the new Readmill app gallery!

Feel free to try out Readmap for yourself or view my profile on Readmill to see what I've been reading.