Motion Apps' mRing (US$20) allows you to assign MP3, MIDI and WAV ring tones to each individual contact or contact category in your Treo address book. Features include:
- Use MIDI, MP3 and WAV ring tones
- Assign ring tones to Categories and Individual Contacts
- Different ring tones for phone call and SMS
- VIP and Silent mode support
- Ascending ringtones and vibrate before ring options
- Assign ring tone to system sounds, known and unknown callers, SMS and voicemail notification and more

The company is offering a promotion through the end of today where you can purchase mRing + mLights for US$21.54 (regular price: US$27.98).

mLights manages the Treo's backlight behavior alowing you to save your Treo battery. Feature include:
- Dim the screen during the night
- Keep your keyboard backlight on during the night, and stay turned off during the daylight
- Save your Treo battery