I've kept the nicer ones in the loft in my "grandmother box" it will be a long time before I need them but I've seen my parents have to go out and buy stuff when their grandchildren appeared so I thought I'd store stuff like brio etc.
I am keeping some, my parents kept loads of mine which I really appreciate now! Especially stuff that is still expensive now, such as brio train set, playmobil, lego etc. There is a number peg puzzle that I am keeping for sentimental reasons too, DS adored it and carried the numbers from it around for about a year
So far I haven't missed anything that has gone to the charity shop.
DH's parents kept leggo and other collectable type toys. For years (pre-DC's) I thought they were a bit OTT, carting it from one house to the other when they moved. I'm really glad they kept it all now.
I'll probably keep leggo, brio and possibly playmobile.
ooh, such a good question. DD1 is nearly 6, DD2 is nearly 3. I've kept the classic picture books, and put the others in charity. I've put quite a few of the baby toys to Nearly New sales and charity shop over the last 2 years with no regrets yet. I've kept their baby comforter toy, special teddy and teether. I reckon I'll keep the ELC Happyland, the wooden railway track set, and the wooden garage set. Like others have said, for a grandmother's box rather than sentimental.
I'm going to take photos of the kids playing with all their toys for the sentimental fix - I'm not storing it all.
My parents kept all sorts and I love seeing my children playing with my old toys! Obviously they didn't keep tat but things like Fisher Price garage and house, lego, etc. I suppose it depends how much space you have!