I like the idea of it, but as Enkidoh said above some of them aren't obtainable any more and would forever taunt you (I know that would drive me nuts...)

It could only show ones that are still available to get, but then it's no longer really a complete list and (to me anyway) doesn't that defeat the point in a way?

Surely anyone actively collecting them (either mounts or minions) probably knows which ones they don't have? (and/or knows places to get the list from to find out?). I do appreciate that is quite the assumption though.

What I would really like is a search interface though... I'm up to 197 of the 201 minions and that's 8 pages to look through whenever I want to find a specific minion. I can't be the only one with this problem?