Thanks to Princeton University Press two new books are published.
I didnt read yet but in this month i hope so that i will :)
I think that, if you've been learned and solve problems on the exams about Turing Machine or related with, this book deserves to be read by all of us :-)
http://press.princeton.edu/titles/9780.html
http://press.princeton.edu/titles/9779.html
For Amazon.com's customers :
http://www.amazon.com/s/ref=nb_sb_noss/181-1625451-3000115?url=search-alias%3Ddigital-text&field-keywords=alan+turing+princeton+press