Ambrosia Software last night introduced iToner 1.0.6, offering up support for iPhone OS 1.1.3.
The update the iPhone custom ringtone transfer tool offers improved support for iPhone, along with other bug fixes and improvements.
Exempt from per-ringtone fees, iToner lets you drag-&-drop MP3, AAC, WAVE, and AIFF audio files you own to your iPhone for use as custom ringtones.
The iToner 1.0.6 update is free for all registered users, and may be downloaded here.
iToner costs $15, requires Mac OS X 10.4.10 or later, and is a Universal Binary application.