We are currently writing a book about symfony, which will be of great use to all devs who want to build up applications with symfony.
If you don't know anything about symfony, this book will teach you all that you need to know. If you think that you know all there is to know about symfony, think again: this book will contain a lot of new explanations and examples to help you unleash the true power of the framework.
As the book is being written, it won't be available before a few months, so in the meantime you can still refer to the online book to learn about symfony. If you're interested in its content, keep reading this blog: We'll probably release a beta version of the book in PDF version before it's printed. We'll tell you more as soon as it's done.