Mauro and I have created language subpackages of most gnome packages that will be going into openSUSE 10.3.
Since I was touching so many packages anyway, I've made the install process of virtually all gnome packages call fdupes. Second (and third and fourth and ...) duplicate files in the install root are converted to symlinks to the first. For some packages, this is effectively a no-op, but now it's done nearly everywhere and will help with keeping packages lean and mean in the future.
Both of these changes should result in a nice size reduction, which is especially sweet given that they don't cost anything in features or performance.