DNS & BIND book question

I just picked up an O'Reilly book on "DNS & BIND" 2nd ed., which covers BIND
4.3.x and 4.9.x, but it predates BIND 8. It was only $14 at Fry's, and I
figured that most of the theoretical info in it is still current, but that the
config file info is outdated since the file formats have changed. Does
anybody familiar enough with the diffs between BIND 4.9 and BIND 8 have any
suggestions on anything significant to ignore or pick up elsewhere? Or should
I just return the book?

-David Schwartz