Just thought I'd add in my two cents on making iced tea at home! I used to work at a Seattle's Best Cafe many moons ago, and the method of brewing their fantastic iced tea was pretty simple:
Steep tea bag in water just off the boil as you would for hot tea, but only pour in half the amount of water. Once it's finished steeping (generally 4-5 mins for black tea) remove the bag and top up to full volume with ice cubes or very cold water. It'll both cool down and dilute the concentrated tea you just brewed. Pour over a glass of ice, and bob's your uncle!
You can always play with how much ice/cold water you add depending on how strong you prefer your brew.
This works for large batches too, just scale up the number of tea bags proportional to your desired end volume. Added bonus: this method works great for those who like to sweeten their tea! Just add your sugar or honey to the hot tea concentrate before cooling it down. It'll dissolve nicely.
