Shara Karasic from Appolicious recommended me this book on App Marketing. I just got it delivered into my hands.. it's a fantastic read. http://www.amazon.com/App-Savvy-Turning-iPhone-Customers/dp/1449389767/ref=sr_1_1?ie=UTF8&qid=1320399965&sr=8-1
you should also check this book: iPhone and iPad Apps Marketing: Secrets to Selling Your iPhone and iPad Apps (2nd Edition) I have both books and I must admit that iPhone & iPad Apps Marketing covers "the topic" much better
Thanks for the suggestion. I already read the App Savvy, but now I bought this one for my Kindle app... Look forward to read it!