Through out your travels you will meet many, many people. Some will be locals, and some will be from other countries, but regardless they will be people you will want to keep in touch with after you return home. Oviously email is the best way for this to happen, a friendly note to say hello, a card for Christmas or Birthday, or an unexpected phone call is something you should do. The people we meet when we are over seas are a big part of what makes our trip so amazing...
I love the fact that I have friends not just from where i live, but from all over the world...from Spain to China, From Sydeny to New York, the world is a hell'of'a lot smaller now that I can keep in touch so easy, I make it a point not to let those freindships drift because of distence..