This site uses ratings, comments, re-tweets, and other social media tactics to make it easy to share the ads with friends and colleagues. They also have an unusually strong collection of international spots which is especially useful for getting a fresh perspective.
In the Research section you’re likely to turn up some real gems of vintage advertising, including lots you may have seen as kids.
You can also limit your search to a particular medium (e.g. digital, radio). A personal favorite is the ad for the Reebok Easy Tone. The first 22 seconds of this clever ad created in Sweden consist of an oprea singer belting out “bum bum bum” in various pitches followed by a quick one liner, “Give you’re bum a better tone!”