I just posted this to another thread, but I think this is relevant as well. While this isn't a tutorial, there are some great examples of what you're looking for and *almost* works out of the box.
There's a component someone as started as an open-source project. It comes with a xcode project and examples of how to track touch events - even pinch zoom. That said, it's not very responsive and has some serious bugs I have not been able to resolve - such as failing to work after a short time. It's also very slow to load when compared to Google's native app. If anyone knows of a better project or knows how to improve this one, please share!
iphone-google-maps-component - Google Code
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