Yes and no.
They don't understand the whole gift giving/getting thing yet but I always make a list of things that I want to get them.
Yep, I have it in my office and I'm buying things off of it a bit at a time.
Yes and add to it every day.
Yes the younger ones do
Yes they do
both their lists constist of every toy they have ever seen plus some..lol (their 6 and almost 4)