This book provides a decent overview of eBay development, but it stops short of providing many direct solutions to programming issues. It's more of a reference (which it does an ok job of being), full of tables of values, etc. However, that's all available in eBay's documentation.I was not at all happy with the author's use of C# psudo-code rather than showing actual code. Did he have some super-secret app that he didn't want to share? I downloaded the code from the web site, but there were many examples that did not work.Your choices with this book are C# and Pearl. There's not a line of VB.NET. Also, the web site only give you the sample code... nothing up there about new changes (such as Auth & Auth) that eBay has recently added.Overall, I'm not really happy with this book. It feels like it was released to get something out there first, not best.