The answer's simple. Two years ago, I took a two day training course, offered by Dan Grigsby. That two day course flattened what would have been a 3 month ramp up into 2 days.
Unfortunately, Dan is no longer offering the class. However, with his permission, I'll be offering a similar course, based on some of the same content, May 18th and 19th at CoCo. The content has since been updated to take into account iPad development and new features in iOS 4.0.
The course is designed for Java, .NET, Ruby, Python and advanced PHP programmers and no prior iPhone, Mac, Objective-C or Cocoa development experience is required. It's designed to make you productive in developing non-game iOS apps in short order.
I'm restricting the number of registrants so we can have a small class size with plenty of individual attention.