Pragmatic Bookshelf announces new Pragmatic Guide series
media.pragprog.com
media.pragprog.com
Really wish they'd bring the podcast back, though.
This book is much more concise and assumes the reader has a basic understanding of version control systems and is looking to get up-to-speed on Git.
(I'm almost finished reading your first book and as someone who is very capable with Subversion it has helped me tremendously with grokking Git. Thanks!)
The first book is aimed at getting your started down Git with little or no previous knowledge, the second book serves the same purpose assuming you have a basic grasp of VCS, but it serves a dual role as a reference.
Check out some of the excerpts that are available on the book's site to get an idea for what it looks like. The idea is that it gives you a quick reference when you're trying to remember how to do a particular task.