We love a Google Easter egg, especially if it has a geeky/nostalgia bent. And it's hard to imagine something that hit sboth categories as cleanly as Google's new tribute to the much-maligned HTML 'blink' tag.
Search for "blink html" or "blink tag" and both words will flash anywhere they appear in the results. As Google Operating System points out, this is done using animations since the blink tag itself is long-deprecated.
(via Google Operating System)