Safari and WebKit Development for iPhone OS 3.0

I bought this book a few weeks ago. I've been reading it and trying to absorb the features in the iPhone's version of Safari.   I'm impressed.  This book contains a huge amount of information about Safari on the iPhone.  So, why is this important when you can have apps on the iPhone? Have you tried to get an app onto the iPhone?  Its not an immediate process by any stretch of the imagination.  With a web application, you can deploy applications immediately to the iPhone without having to go through Apple's AppStore process.  Its a great read and is very educational.