An excellent, well-written book with great examples that should work for both beginners and advanced users. No other book on Palm OS development [I think I own just about all of them] overlaps in any serious way with the topics treated so thoroughly in this book.
The chapters on non-blocking sockets are an absolute must-read for anybody who wants to develop robust, responsive, real-world applications for the Palm OS.
Two nit-picky items: 1) the book is somewhat more verbose than it needs to be because of irrelevancies about "the Zen of this..." and the "Tao of that...". If you ignore these altogether too-cute sidebars, you'll have a generally more productive and pleasant read. 2) there are some occasional stylistic problems with the C-code. Not errors, but things like assignments to local variables that would never be referenced that show up. The code is also somewhat more pedestrian than that employed by most working C or C++ coders. For the large audience, this might be a plus. I think the style makes it more accessible to VB and NS-Basic types. But it will be a little off-putting to the hard-core.