Since I really don't know which forum may be more appropriate to this question I post it here where most of the programmers regularly join in.
I'm studying a bit of AVR ASM and I'd like to buy a book, something that guides me through a consistent learning journey.
I've spotted "Some Assembly Required: Assembly Language Programming with the AVR Microcontroller" by T.S.Margush that looks promising, it's a recent release. I wonder if some of you out there read this book ... is it worth the time and money spent on it?
Or ... you may suggest some other book which deserves more attention 
Amazon link to the book: http://www.amazon.com/Some-Assembly-Required-Programming-Microcontroller/dp/1439820643/ref=sr_1_1?ie=UTF8&qid=1350419631&sr=8-1&keywords=Some+Assembly+Required%3A+Assembly+Language+Programming+with+the+AVR+Microcontroller