regular ears - 1 intact, 1 broken
graduation ears - 1 intact, 1 broken (why do i keep these?)
disneyana convention 1992 ears
2000 celebration ears
santa cap ears
reindeer headband ears
giraffe print DAK ears
Minnie headband ears
25th birthday ears
That's all of the real ones I can think of. I was trying to get a collection going for a while, so I'm pretty disappointed that they didn't make any for the 100th anniversary.
I also have the miniature christmas ornament ears and some other "ears" collectibles like wind-up ears and mickey ears penny bank.