With iToner, a $15 utility, the process requires only dragging and dropping audio files onto the single-window interface and then hitting the Sync button. You don't even need to restart the phone to use the ring tones. Moreover, as the developer claims, the ring tones will be available even after a firmware update is applied to the phone.
iToner requires Mac OS X 10.4.10 or later. A 30-day trial period is available.
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