I posted a couple of days ago asking for clues on how to add fonts to the system. After playing around, here's what I ended up with.
The are two locations where fonts can be added. To add fonts locally, accessible to the current user only, add the font files to the /home/your_name/.fonts directory.
To add systemwide fonts, accessible to all users, add the font files to the /usr/local/share/fonts directory tree, in the OTF, TTF or Type1 directories, according to the type of fonts you are adding. Fonts are accessible immediately, there is no need to restart X or to update a config file.
Also know that subfolders are acceptable inside these directories and that fonts may be moved around (e.g. TrueType fonts in the OTF directory, OpenTypefonts in the Type1 directory, etc.).
It's as simple as that.
BTW, if you like Mac fonts, many of the OpenType, TrueType and Type 1 fonts found on OS X can be converted with a Darwin tool called fondu, and transferred successfully on Fedora (x86).