I write letters to my friends in other states all the time. (: We used to write weekly, but we all got too busy for that, so now we send each other random prizes when we have the time. My friend Tiff got some purple chop sticks from me last year, and another friend is getting a coffee cup soon (alright, so that's technically already hers, but at least it'll come with a letter, right?) And she sent me a heart made of tin foil recently.
I've always preferred writing letters, because it seems more personal than just typing up a message and hitting SEND. Plus, you can draw all over letters, and who doesn't love that?