This java banner served by Doubleclick (and seen on Far Eastern economic Review) lets the user drag and drop musical notes on a score. The banner leads to HP's front page, where the main story is about "the combined strengths of HP Labs and Compaq Research."

That's a quite compelling way to tell their story by letting people experiment and play with the ad, rather than making boastful claims people might be less willing to believe or grant attention to.