Nothing. I also ran find ~/.kde4 -name krunner*, which returned only the krunnerrc files and a few .svgz theming files.Oh, and it would probably help to mention that I am running kde 4.9.1.
I recently installed OpenSuse 11.2 on my desktop PC, and krunner (Alt + F2) has never worked from the start. When I hit Alt + F2, the launch app window pops up, but the textbox is greyed out and it is not responsive to any key presses. So, it is basically useless.