Zynga has a nifty library for rendering ttf font files on iOS that
you bundle with your app. It comes with a
UILabel subclass that can take a
ZFont so it should drop into your app just fine.
It’s released under the Apache License 2.0.
Update: Jason Felice reminded me to point out that you only
need this if you are supporting iOS 3.2 and lower. iOS 4+ supports reading ttf