Since then lots has changed. MonoTouch is now sold by Xamarin and is at version 5. Also, Apple’s Xcode kit, which is used to design MonoTouch UIs has bounced from version 3.x to version 4.2 with huge changes therein.
Because of all this, those articles have been horribly out of date for some time.
However I’ve now updated them both. Use these links to access my updated MonoTouch introductory article and MonoTouch extensive tutorial, the latter of which covers navigation controllers, SQLite, location-detection, some sensors, web services, splash screens and more.