I just noticed a couple weeks ago and that is that if you click on the I'm Feeling Lucky button on google when there is a different google logo it shows you all of the different logos there have ever been. It is pretty cool.
i never use im feeling lucky because when you type in a famous person eg "wayne rooney" you get taken to Wikipedia which is not a very trustable site because you can change the text there. and i like to see what i can click