[srwatters]

There are many masters of the headshot...
One of them is a frequent contributor here...

JT, Take a bow. http://www.supershoots.com/gallery_beauty.cfm

I also like Kevyn Major Howard http://www.headshot-photography.com/
and Mark Robert Halper http://studiomark.com/headshots-women.html

Perhaps I should start using initials or my middle name... Nah.. I'm just not that good; Yet
http://www.polodigital.net/gallery/headshots/

Start with great light, a medium telephoto lens (85-200mm), and then add some magic...