From Ringtone4Me:

iPhone Mobile Ringtone Composer is a ringtone composer for your phone. You can write your own colorful music for your phone as ringtone. And you can convert your favorite midi file to m4r(iPhone ringtone), mmf(smaf format), MP3. And convert part midi file to m4r mmf and MP3. iPhone Mobile Ringtone Composer is dedicated to music writing for iPhone ringtone. Easy to use, iPhone Ringtone Composer offers a user-friendly interface and powerful capabilities. Now used by a very active community of thousands of people, it has become a favored tool for creating iPhone ringtone.

The features:
* Compose music and save to m4r, mmf, mp3 and midi format.
* Load midi file and save to m4r, mmf and mp3 format.
* Compose your own music by click mouse, setup different key signature, clef and meter. Setup score tempo.
* Music notation input can be performed through the mouse easily.
* Save part of the long midi to iPhone ringtone easily.
* Offers 128 standard instruments.
* Zoom in/out your score and edit it accurately.
* Drag the score to view any part of the staff.