I am keeping a running list of Google and other search related sites April Fools jokes at Search Engine Land. So please check out that post for more on the various jokes.
My favorite are the 3D ones, especially since YouTube is really 3D and they went text only. Of course, Google changed their name.
Plus a lot more.
Forum discussion at Google Blogoscoped, Google Maps Help, WebmasterWorld, DigitalPoint Forums, Google Web Search Help and Google Webmaster Help.
