Google Search
On October 30, 2009, for some users, the "I'm Feeling Lucky" button was removed from Google's main page, along with the regular search button.  Both buttons were replaced with a field that reads, "This space intentionally left blank."  This text faded out when the mouse was moved on the page, and normal search functionality is achieved by filling in the search field with the desired terms and pressing enter.  A Google spokesperson explains, "This is just a test, and a way for us to gauge whether our users will like an even simpler search interface."  Personalized Google homepages retained both buttons and their normal functions.