iPhone App Dev

Forgive my general nature here. Brand new to iPhone apps (been devloping applications for a long time - many on RAC). Can you describe how you price a project for iPhone development?? Is it per hour, or if I give you a detailed spec, will you do fixed price (which is what we have always done on RAC). What does a typical (yes I know that is amazingly vague and open ended) application cost to make it iPhone ready?? We have the application running already for web and email - and want to make it avaialble on iPhone. If you can give me any sense of what to expect from that - I would like to go forward. I'm happy to answer any questions I can (some may require NDA) ## Deliverables Details to follow