The "heads" that adorn the books of the Head First series are all (currently) from a professional modeling agency. I don't see other uses of, say, the nerdy-looking guy on HF Java, but I occasionally see the model from the SCWCD HF book. I saw her on a billboard in San Francisco a few years ago.
And, no, I don't know her name. Cute, 'though, it's she?
May be a few not interested in Java start getting attracted in this stuff...
Regards<br />Sandy<br />[SCJP 5.0 - 75%]<br />[SCWCD 1.4 - 85%]<br />------------------<br />Tiger, Tiger burning bright,<br />Like a geek who works all night,<br />What new-fangled bit or byte,<br />Could ease the hacker's weary plight?