Old and reissued in 2003 by Fantagraphics Books. Only got round to read this now and it's one of the most fun piece of comics criticism/personal memoir/pop culture ramblings I've read. Rivals Larry Niven's 'Man of Steel, Woman of Kleenex' (1971).
Check some of it out:
My favourite is Chapter 9: "Had I been only 6 years older I could have been in comic books from almost the beginning: carting my sample case in the spring of 1939 instead of 1945..."
In Kill Bill 2, Bill's speech about Superman was taken from here.