Regularly, this forum has threads about changing the default font from Myriad. Especially one case proved extremely difficult, and a subsequent investigation revealed a rather intricate set of rules.
I hope others will contribute; maybe this thread can even form the basis of a FAQ.
I have tried to make a summary in the second post (no one reads the first post), which may serve as a first draft FAQ.
You may read a full version of how to do it here (first hint in the list, last part):
<http://www.bugge.com/Family-and-friends/Illy/illy.html>
I have used posts to present most of the contents, not to clog this thread with a monstrous topic text.
Posts: n/a