I started up iCal a while ago to set a reminder and it popped up with several that should have appeared over the last week or so. I
think I have "iCalAlarmScheduler" in my login items...yep, but it appears that the pref panel doesn't know what "kind" of 'thing' it is. It's listed as "Unknown", nor do I see anything by that name in a search of the HDs...

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later:
It was in there all the time, just didn't look far enough down the list. Typed in "ical" and hit "iCal Helper.app". Figuring that "Alarm" should have come before "Helper" I gave up.

But the actual title is "iCalAla...", no space.

Stupid me.
But it was still not selectable via a normal navigation window to put it into the Login Items list.
But I discovered that a 'drag-n-drop' works just fine, thank you, very much!

Where there's a Will there's always a Bill, or something like that...

And, it now is seen as the true ".app" that it is!

I just hope that will correct the problem of the 'reminders' not reminding!