Voice2Ringtone lets you use your own voice recording as a ringtone. Use your sound enabled computer with a microphone to capture yourself or surrounding sounds. Edit the sound captured to your liking, then save and upload it direct to your cell phone for use as your new ringtone. Record your friends, animals, cars, trains... anything! And use them for free ringtones!

http://www.monkeybongo.com/EULA.html