Today brings a lovely treat from Rogue Amoeba, the makers of Audio Hijack Pro and Fission. They've posted MakeiPhoneRingtone, a free utility that converts any AAC file into an iTunes
18.104.22.168.1-compatible Ringtone. Drop the file onto its window and a second or two later, it appears in iTunes as a new ringtone. No file renaming, no special tricks. It just worked. I synced it over to my iPhone without any snags.
Of course, Rogue Amoeba hopes that you'll use its Fission editor to make those ringtones. If you're like me and prefer non-music-ringtones, its Audio Hijack Pro may be a better choice for recording sounds like a knock on the door or the most annoying ringtone ever made.