Here a little tool that may not be very useful (Apple rejected it for not being very useful) but maybe someone likes the idea. It just blocks your keyboard input so you can wipe over your keyboard in order to clean it.
What's new in version 1.0
ReleaseMarch 11, 2011
Date AddedMarch 11, 2011
Operating SystemsMacintosh, Mac OS X 10.6, Mac OS X 10.6 Intel