One of my closest friends moved to live in Australia 5 years ago and we still write proper letters to each other. We do email a bit and call very occassionally but its so nice to get a letter from her and when i write one it is different from emails, much more detailed and personal.
We shouldnt stop writing letters, they are reminders of the past. I have a huge collection of all the letters i've recieved in my life from the very beginning and i love reading some of them now. I hope future generations of my family will enjoy them too.