If you are just getting started with developing iPhone Applications with C# and MonoTouch, you may want to check out a free video from Developer Developer Developer 8. It isn't the best quality, but it will give you an idea of how to use MonoTouch with C# to develop iPhone Applications.
C# on the iPhone with MonoTouch
An overview of what's possible using Monotouch, Novell's new tool, to enable C# and .Net based applications for the iPhone and iPod touch.
Find out what you need to start using Monotouch and how to create a sample application. If you have any questions on why you'd use this, what are the benefits and downsides of using Monotouch then this is your place!
Check it out here.
iPhone Development