I remember C'thun Warner as the first case of a mod that dealt specifically with proximity. What I'm looking for is a little different.
I was playing AV yesterday and noticing once again that people always leave healing range in the middle of casts. Is there any addon that displays how many of x class are in range, or say how many healers are in range of you? It wouldn't be for me to use myself since I am always in range of myself. Rather it would be for others to know "oh there are only 2 healers in range of me and oh look one of them is in cat form."