Wizoobooks have published a SynthEdit ebook. On the front cover they describe it as the cookbook for SynthEdit maniacs :) Personally I think this is great news. SynthEdit is one of my favourite pieces of free software. I love it's simplicity and scalability. The community group is a fantastic and friendly place to go for information. Designer Jeff McClintock and module creator Dave Haupt go out of their way to help people. The help files alone in Dave Haupts modules shows the attention to detail and care that goes into designing his modules.
Although there are a few places where you can get information on SynthEdit, it is always going to be somewhat of an uphill battle for those unfamiliar with modular synthesis. I think an eb00k is a great idea. I have not seen it so I can't say if it's worth the asking price of $14.99. Most examples featured in the book are also as .se1 files in a zip file Synthedit-examples.zip. It doesn't help that the website does not give a breakdown of whats in the book. However Wizoo products are usually decent and their guide to the Nord modular won many friends.