I'm not sure if this applies to changing fonts, but I made my prefs file rw
I did that because the home page setting didn't stick.
I load an image on /hdd3 as home when Netfront starts, so it doesn't try to connect.
the file "prefs" is located here on a C3100:
/home/zaurus/Applications/netfront3
Now back to your question.
In Netfront, select tool > browser setting. Select View tab. The font selection is in the bottom third of the tab.
Netfront will ask you to restart to make changes take effect.
(this is why I don't think my above changes to prefs matters, if it does, let me know)
When I first installed Netfront into Cacko Lite, none of the settings would stick.
I first started by editing prefs manually, then decided to make prefs rw
Opps, I forgot. If you don't know how to get the fonts onto your Zaurus, read Meanie's page here:
http://www.users.on.net/%7Ehluc/myZaurus/custom.html#customsearch for makeqpf
EDIT: I used the wrong word the first time I replied, it's called "prefs"
hope this helps
Jon