Ringtone Volume
I spent a few minutes selecting the portion of the song I wanted to use (instrumental portion), and specifically selected portions with high pitched sounds that I should be able to hear just fine when the iPhone rang from within my belt holster. It sounded perfect on my Mac. However, after I created the ringtone, and synched it to my iPhone, I was sorely disappointed to find that it was so soft as to be unusable.
What's disappointing is that Apple clearly knows that ringtones need to be louder to be useful. The default ringtones on the iPhone are clear and loud on the iPhone's tiny speaker, however limited they may otherwise be. Since user created ringtones are uneditable, and there was no option to adjust the volume in the creation of the ringtone anyway, I probably won't be creating any more.
There needs to be a way to try out your ringtone creations on your iPhone before committing your payment, since there's no correlation between how it sounds on your Mac and on your iPhone.
PowerMac G5 Dual 2.7GHz/3GB/250GB/SD/AE/BT/ATI 9800 Pro (128MB), Mac OS X (10.4.10)