Create a great logo for an iphone app!

Hi there, thanks for your interest in this project! I am looking for some help creating a great logo for an iphone app. The scope of work is very simple and straightforward: 1. Design the logo and provide revisions based on feedback until we reach a final product 2. Supply the logo in .AI (please no substitutions here, must be .AI and saved in CS4 format) For the moment, that is it! Please send samples of previous logos that you have done, along with realistic timeline for this project. Thank you.