I do think that the majority of members on here are "good eggs" and as such would support mostly any charity, because it is the forum charity.
There may be a silght uptake in interest because of personal experience / it's flavour of the day...like Help for Heros, but I think we would all chip in and support the chosen cause, regardless of size/scope.
My own personal experience is with Leukemia. It was fortunate that I ticked the right box when I started donating blood as a student. About 5 years ago I was told I was a match with a small boy in France who had Leukemia -he was 5 years old.
So I donated my bone marrow and afaik, he is sill alive and doing well.
So..to add to the list, that's my two penneth.
Jonathan.