I just wanted you guys to know about my new book about using free tools for post processing your images.
It covers many different free tools, such as GIMP, imagemagick, ufraw, hugin, qtpfsgui as well as an introduction to Canon Hack Development Kit (CHDK) that enhances some Canon camera features and adds the ability to shoot in RAW.
I think that this book will be useful for many peope in this community. It is always nice to use free software for post processing your images. You can learn how to make HDRs, panoramas, correct lens and perspective distortion as well as many other common tasks (removing red eyes, reducing noise, etc).
You can get it at amazon:
I hope you enjoy it