While documentation for Symbian OS developers is available on line, having a printed book (with usefully large margins) are incredibly useful for developers to have beside their workstations; and of course the books allow a much greater depth in specific topics, as these two new books illustrate.
From the Press Release...
Multimedia on Symbian OS - Inside the Convergence Device
Consumers expect a compelling multimedia experience from the latest Symbian smartphones. This book helps developers deliver that innovative multimedia experience. The central chapters of the book provide a detailed look at the native APIs for accessing camera, video, audio, image manipulation, and radio tuner functionality. The chapters walk you through the available user interfaces with examples of typical usage. With the wide variety of smartphone hardware out there, as a developer you need to know how to target multiple devices with different capabilities in a single application. Strategies for dealing with this complexity are highlighted throughout the book.
Common Design Patterns for Symbian OS
The Foundations of Mobile Software - Symbian's best software engineers share their knowledge (mostly learnt the hard way) and experience in this latest book from Symbian Press. It distils this knowledge into a set of common design patterns for developers to use when creating software for Symbian smartphones. This book provides developers with a set of patterns to elegantly solve common design and implementation challenges faced when creating robust software for smartphones. Knowing the potential traps - and the patterns used to solve them - will give any developer a head start in creating great Symbian software.
The full press release can be found here.