Ringbacks
More from Gizmodo, ringback tones to be offered on a cell system near you.

In case you didn't know (I didn't) ringback tones are apparently custom ringtones you can select that people will hear when they call YOU.

I personally think it will be more interesting when a ringtone that you have selected plays on the phone of whomever you are calling. In that way, people will know it is you when you call, and you can standardize the ring tone that is you where ever you call (it will have to be overrideable, of course).

Now everyone will know that it is me when their phone starts belting out a heavy metal cover of "Teddybears' Picnic".
- posted @ 9:55 AM