I'd like to look over some really good iOS apps to see how they're put together. I've specified 'complete' because I'm more interested for current purposes in strategy than tactics (but hopefully the code will be tactically well-made too). 'Complete' needn't mean 'large'.
My own initial priorities would be that the overall design be cocoa-idiomatic (ie. make good use of what Apple have provided for us), with a heavy emphasis on classes being as decoupled as is possible within the relevant design constraints. But I'd be interested in any answers that give good reasons for specific openly-available code bases to be worthy of close examination.
Edit: Though my primary focus here is on apps, instructive examples of libraries could also be of interest.