Hello,
last week me and my friend released a new iPhone app - CG Transit. It offers offline trip planning in public transport systems of more than 20 U.S. and Canadian cities and Europian trains. Of course it covers Chicago and it is free.
Because we don't live in Chicago, we will really appreciate your comments. We hope that our app can help you.
You can download it on the AppStore http://itunes.apple....48814?ls=1&mt=8