TheGeekStuff is giving away a free copy of Linux 101 hacks for subscribe to them by email or by RSS feed. Password is displayed at the end of each post. Open this RSS Feed and you can see the password at the end. The author of this book is Ramesh Natarajan, though it does not have actual hacks, this book has a lot of helpful stuff.
After you get the password, grab it at the Download page.