Where are you seeing that? I checked the sounds pref and the alarm sound lists and don't see it anywhere. Are you referring to alarms or ringtones? Does it pull it from your iPod song list? Custom ringtones have been around for awhile if that's what you're talking about.
"Has engine else noticed..." - are you sure you're in a proper state of mind? Maybe you just imagined it all.
u go into clock-alarm-( then the top left button... Manage or [ I'm from Austria, so I don't know what exactely it's called in the English version])-then the little arrow next to your alarm-sounds
U can choose from your custom ringtones!!
Sorry for "engine"-