> I forgot about iced tea, but I'm under the impression that how popular it is depends on the region of the US you're talking about. I don't see a lot of people drinking iced tea in my area, and I don't think I've ever seen anyone make it for themselves.
Sweet tea is quite regional (the South).
Iced tea's popular in much of the country, but I think making it at home has dropped off just like making many other things at home has (how many people make their own stock or broth anymore?). These days, a gallon of store-brand iced tea is just about the cheapest drink most grocery stores stock—barely more expensive than making it at home, really, so why bother?
[EDIT] For foreigners wondering WTF the difference is between proper sweet tea and normal iced tea with sugar added: you add the sugar during or before steeping, while the water's nice and hot, and, usually, you add a lot of it. The difference in the finished product is kinda like the difference between making a mixed drink with simple syrup, versus using granulated sugar. You can cleanly dissolve a lot more sugar in hot water than cold (see again: simple syrup), and it tends to stay well-dissolved even when it cools. It's commonly believed that it also affects the flavor, not just texture and level-of-sweetness, but that may just be in our heads (I think it does, too, but can't explain why—it's not like we caramelize the sugar or anything like that)