I personally wouldnt have the balls to enclose a list or ask for money or anything like that, but I would be grateful if people added a list when I am invited to weddings, as at least I know that I have contributed to something useful that they wanted, I wouldnt however give money as a gift, I'd rather bring nothing than give money. Too tacky.
So far as baby showers, I think that they are a very good idea, I am 30 and lost my mum when I was 28, it still feels like yesterday and she was all the family I had, fortunatley I have some very good friends who have helped me immensely in preparation for my first baby by throwing a baby shower, they went to great lengths and a cried like a baby!
I could do it all on my own but its nice to have friends that care.
Tam x