Having recently installed Debian Etch, I was quite happy with the default Gnome setup … except for fonts in Iceweasel. There’s a tendency for some sites to use jagged bitmap fonts.

I found the solution here. You just need to do the following:

cp /etc/fonts/conf.avail/70-no-bitmaps.conf /etc/fonts/conf.d
fc-cache -vf

I also installed the MS$ core fonts as well:

apt-get install msttcorefonts