From imtoo.com:

With ImTOO Windows Mobile Ringtone Maker, you can convert nearly all video and audio formats including AVI, MPEG, WMV, DivX, MP4, H.264/AVC, AVCHD, MKV, RM, MOV, XviD, 3GP, WMA, WAV, RA, M4A to MP3 as your Windows Mobile device ringtone. Besides, this ringtone-making software is capable of transferring MP3 ringtone to your Windows Mobile device including Nokia, Samsung, Motorola, T-Mobile, Blackberry and so on directly after making the ringtone.

Key features:
1. A variety of Windows Mobile devices are supported: Nokia, Samsung, Motorola, T-Mobile, Blackberry and so on.
2. After making Windows Mobile ringtone, this Windows Mobile ringtone creator can help you transfer the converted ringtone to your Windows Mobile device automatically if you want.
3. By drag and drop or setting start time and duration, you can extract any segment you love from music or video file and convert it to ringtone for your Windows Mobile device.
4. This ringtone maker for Windows Mobile provides you with a built-in music player to listen to the loaded or trimmed file before conversion to ensure you get the right music converted to ringtone.
5. Just need to add file and click to convert, you can make Windows Mobile ringtone from any video/music file with this ringtone creator effortlessly.
6. This Windows Mobile ringtone converter provides English, German, Japanese and Chinese interface languages for meeting different mother-tongue users.