Why don't more businesses offer free ringtones?
My sister just spent $2 for a new ringtone for her cell phone. (It was a song clip.) That got me thinking. If M&Ms were to come up with a catchy line, use it in a funny commercial, and then offer it for download as a ringtone on their site -- people would go and download it.
This would work for almost any company. Especially any that try to appeal to kids, teens, or techno-weenies.