Great Budget Backpacker's Guide
The Let's Go series is fun and irreverently informative. The Australia guide offers many budget insights and interesting facts about this great country.
I have found that the Let's Go books definitely cater well to the rough backpacker, but if you're faint of heart or looking for any fancy frills, this book is not for you.

Let's Go Australia
It is very useful for traveling, it can be your bible and your guardian angel, and is very updated, the only problem is that you do not have any photos of the places to visit.A "Must Have!!"

Pretty Much for Backpackers Only
The Let's Go books are generally pretty useful but this Australia guide is geared to backpackers. Virtually all of the hotel recommendation are hostel or camps... no options or suggestions for other hotels or price ranges. I haven't gone on the trip yet but I suspect that all the restaurant recommendation are also low budget as well. I bascially have to get another guide book to supplement this one.

better than lonely planet
it has most of the same loding options and usually a couple more. very accurate on prices. covers some areas better than lonely planet, more of a backpackers book. bad maps though. sometimes tough to get a good idea of a city.