I have been wanting to dive into developing and deploying a real iPhone application but have had a hard time deciding on what type of app to make.  I recently came across an article talking about the CTA developing a web services API that will allow developers the ability to access all GPS data and arrival times for the buses in the system.  This seemed like it would be a great candidate to use in an iPhone app because it would consist of getting data from web services, saving user data locally, using the maps api, displaying different views and controls, and parsing xml into objects… plus… it is an app I can actually use since I ride the bus a ton during the winter.  In the next few days I’ll be posting my experience as I build this app… I’ll try and throw in some tutorials as I go along.