Excellent point from Miss The North regarding individual freezing on the cookie sheets. I do that with raspberries. I don't usually have enough freezer room for doing that with loads of peaches. But it is a great idea.
I also don't use citric acid and mine don't turn brown either. I think...
I freeze using this method:
Boil pot of water. Put peaches in for about 1 minute. Take peach out and put into ice water (or at least cool water). Wait a couple of minutes for peach to cool. Slip skin off - if the water is boiling and the peaches are ripe, usually the skin comes off pretty...