Odd thing just happened to me. I just updated several packages, and suddenly my fonts in gnome applications shrunk. It doesn't seem to have affected gtkhtml (the evolution editor and viewer), just all the menus, frame text, etc.
Below is a list of the gnome/gtk packages I updated today, and some possibly related ones. Any ideas what caused it? BTW: KDE is unaffected - so I know it was a gnome update. ibunicode0-0.4.gnome-4mdk.i586.rpm libglade-gnome-db0-0.17-4mdk.i586.rpm libgail17-0.17-1mdk.i586.rpm libghttp1-1.0.9-4mdk.i586.rpm libunicode0-devel-0.4.gnome-4mdk.i586.rpm libgtkhtml2_0-2.0.0-3mdk.i586.rpm libgtkglarea5-1.2.3-3mdk.i586.rpm libglade-bonobo0-0.17-4mdk.i586.rpm libglade0-0.17-4mdk.i586.rpm gail-0.17-1mdk.i586.rpm libglade-gnome0-0.17-4mdk.i586.rpm gnome-pim-1.91.1-1mdk.i586.rpm libgtkglarea5-devel-1.2.3-3mdk.i586.rpm libglade0-devel-0.17-4mdk.i586.rpm libcapplet1-1.5.11-3mdk.i586.rpm gphoto2-2.1.0-6mdk.i586.rpm libgphoto2-2.1.0-6mdk.i586.rpm libgphoto2-devel-2.1.0-6mdk.i586.rpm ghostscript-7.05-7mdk.i586.rpm locales-en-2.3.1.3-3mdk.i586.rpm glibc-devel-2.2.5-14mdk.i586.rpm glibc-2.2.5-14mdk.i586.rpm locales-2.3.1.3-3mdk.i586.rpm TTFN, Lonnie Borntreger