I completely agree with just not having it entirely. However, in today's society I don't feel that this would ever occur, as everyone is always anxious to figure out everyone else's (irrelevent) personal business. With this in mind, I'll have to agree with even the addition of an "other" option being an improvement, at the very least. Alongside that, an "I'd rather not say" option inclusion should be mandetory, in my opinion. I'm not too keen on the whole "fill in the blank" option, though, as I could imagine that only causing more problems, it's good in theory as gender isn't always so cut and dry, as they make it out to be. The "buffet approach" as stated above, is probably even less likely to occur than the lack of having the marker at all, because as stated previously, even the addition of "other" is a big step for the general public.