In some books, the characterization of the main characters is deep enough to give the reader a glimpse of what it is like to be that type.
The main characters in most of The Asian Saga by James Clavell are ENTJ's.
Specifically, the book Tai Pan and it's character Dirk Struan demonstrate the way an ENTJ thinks.
I'm curious to see what books others think demonstrate which types.
EDIT: I think any ENTJ would really like Tai Pan and I would highly recommend it to anyone.