Fonts Can Make or Break PDFs
http://www.creativepro.com/story/feature/20045.html

Perets, Shlomo
Creative Pro
2004

Abstract:

Acrobat's intelligent font substitution is a godsend for office documents, but it can be a nightmare in situations where font fidelity is important. If you're a graphic designer, then you need to know how to work with fonts in PDFs.