Well, don't think there's such a thing really. U just use audio editing software and take 30 second clips out of full songs. I use sony sound forge and have been for years.
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Download that program and like dave_sz said you can edit your music. Works great because you can custom your music for the personality type of your caller.
I use Audacity. It is free and complete. There may be a bit of a learning curve for some. But you have control of the gain, fade, ability to mix multiple songs, cut sections out and add them in.
Macromedia Flash, Final Cut Pro, Garageband, Windows Movie Maker, iMovie pretty much any video/audio editor will allow you to edit audio files. So you have a lot of options.
Another vote for audacity. Just a note though, after creating your fabulous ringtone, you must export the ringtone as an mp3. This requires you to have the lame.dll file on your computer as well (free download).
