Earwacs в Android Market

Earwacs (v. 1 Rel 2) Разработано Eerbtech

Change default ringtone when headphones are connected, then replace original ringtone when headphones are disconnected. Only works with devices that have a headphone jack.

Instructions:
You need to select a Ringtone before you can start the Service
To start background service: Click menu, select Service, click Start