If you're a fan of Deadlands, the Marshal's Handbook is an invaluable addition to your collection. It includes a wealth of background information, details about the setting (including additional rules), and an extensive list of monsters, NPCs, and mundane animals. It also includes a large, full-color illustrated map of the weird west at the end.
The full-color PDF is beautiful, so much so that I'd probably be tempted to skip the PDF and buy the actual book instead - it's also the kind of book you'd want to have handy at the table.
The Reloaded Marshal's Handbook is definitely an item I'd recommend to anyone whose fallen in love with the Deadlands setting and rules.
[5 of 5 Stars!]