What's the best method for making iced coffee?
Do you like it cold-brewed? The absolute best thing to do from my perspective is to stir half a cup of grounds into a quart of water and let sit overnight; you can then filter it using your french press or a regular plastic filter the next day to get a low-acid coffee concentrate. Mix one part of this with 1-2 parts of water (hot or cold, adjust for strength) to get coffee. The concentrate keeps well in the fridge too.

The only problem is that the coffee you get will be very low acid; if you like your iced coffee more acidic, this won't help. For my palate it's great, but YMMV.