A great app idea for e-readers/tablets involving e-books

I'm not too sure how much stuff needs to be written and so forth but my idea is for an app that goes on all upcoming tablets / e-readers. So this would entail an app on hopefully ios, gingerbread/froyo if they scale a version for tablets and stuff, maybe chrome os if that could be on tablets, as well as like the kindle and nook if thats possible. I don't want to put too much on here so if you'd like to hear more contact me.