I've been interested in Chuck assembly language book for some time. I finally got off my duff and ordered it through his site: http://www.zbaird.com/
While I nearly always use C for my AVR code, I think I'll learn enough useful tips in Chuck's book to be a worthwhile read. Even if his book is all blank pages, Chuck has been so very generous giving products to others, that doing this small bit of support seems like appropriate reward for his generosity.
BTW, the wikipedia page http://en.wikibooks.org/wiki/Embedded_Systems/Atmel_AVR has an incorrect link to Chuck's web site. Anyone interested in fixing that?