"Safari and WebKit Development for iPhone" provides a good introduction to developing web applications for the iPhone by: showing how to use web toolkits to mimic the look and feel of native applications, how to make use of the features of CSS3 and HTML5 implemented by the browser and how to convert and optimize an existing site for the iPhone. As well as these, there are also chapters on integrating -- and that limits of -- with the rest of the iPhone OS.
That chapter is followed by an introduction to three web toolkits that aim to make it easy to create web applications that look like regular iPhone applications. There is good reason for that, and a quote from chapter 4 sums it up well: "the biggest mindset change for developers is to grasp that they are creating iPhone Web apps, not Web applications that run on iPhone." (page 97) Simply put, outside of games iPhone users expect the same look and feel from any application, hence the need for these toolkits, including the three profiled in the book: iWebKit, iUI and UiUIKit. Of the three, iWebKit seems to be the most powerful and is used in most of the book. Each of these toolkits use the features of CSS3 and HTML5 to mimic the look of native apps.
Perhaps the most useful chapter for web developers with an existing website is chapter 12. This covers a few ways you can convert an exiting website into something more iPhone-friendly, and might make a good starting point for organizations looking take their existing website into the world of mobile devices without committing to a full re-design.
"Safari and WebKit Development for iPhone" teaches readers how to use three web toolkits available to create iPhone-friendly websites, provides a good introduction to the features of HTML5 and CSS3 as implemented in the iPhone's browser, as well as how to convent and optimize websites for the iPhone. The best features of this book is the coverage of HTML5 and CSS3 as it applies to the iPhone and the use of toolkits for creating iPhone Apps. As well, if you have a existing website, this book will provide a fair amount of help, especially in areas where the iPhone's browser differs from its desktop cousins.