A couple of months ago I started working on a Typo3 project for a client, and at about the same time I was asked by the folks at Packt Publishing to review a book, so the choice fell naturally on "Typo3 Extension Development" by Dmitry Dulepov.

The book, published in September 2008, covers the entire extension development life cycle, from planning to uploading it to the Typo3 Extension Repository (TER).