A font handling bug in OS X 10.6.7 has resulted in printing and PDF creation problems when using OpenType PostScript fonts.
Mac OS X 10.4.7: OpenType font problems
PostScript Driver 8.7, ATM 4.6 and OpenType font support
MacTicker and London Exchange; OpenType vs. GX; Another MAXpowr tip
Myst III: patch is due out soon; OpenType fonts follow-up
Odds & Ends: OpenType fonts & ATM; Entourage & Palm syncing; more
Odds & Ends: MouseWare; iBook battery life; Buslink drive; Myst III OpenType; Shrinking large InDesign documents
Impelled by a need to support emoji characters, Mozilla, Adobe, Microsoft, and Google are working to standardize technology for showing fonts that aren't just black and white.
Your iPhone or iPad supports a boatload of fonts but not every single one out there. If you need a font that your device doesn’t support, AnyFont makes it easy to install TrueType and OpenType fonts.
Address Book requires Helvetica.dfont -- other versions can cause problems (freezes)