If you use Gnome, then set your preferred font in qtconfig, it should work for you. It doesn't work in KDE4 (and probably not in KDE3 either). You might need to select a different font and re-select your favorite font and size, then save.

fma38: yes, but APP uses its own QT stuff, somehow, and it ignores external styles, even when I explicitly tell it to use my own QT stylesheet. Alexandre said on IRC that they did that to avoid new trouble with different QT builds across different systems, or something to that effect, but I wonder if APG used my system's QT whether that would result in a more stable APG... or not? At least I could upgrade as soon as new versions of QT are available... The font issues would definitely go away.