Pen Pals have been a favorite tradition for many years, allowing people of all ages to make friends all over the world or keep in touch with old friends who've left town some time ago. Postcards are a great way to drop a lighthearted message while keeping it short and even collectible. Postcards let the sender's personality shine through, with a variety of pictures and designs letting you express yourself in different ways.
Postcrossing, a website based on a worldwide project to get people to send postcards to each other through randomly generated assignments, is helping keep the tradition of postal / snail mail alive. Once you sign up (it's free!), you're eventually given the address of someone anywhere in the world. You then send out a postcard, with no specific deadline, to your first recipient. Once they get your postcard, they then register the card on Postcross where you can show off your cards.
According to the Postcrossing website: "You can have up to 5 postcards traveling at any single time. Every time one of the postcards you send is registered, you can request another address. The number of postcards allowed to travel at any single time goes up the more postcards you send!"
I think this is a pretty nifty project. Not only is Postcrossing helping the snail mail cause, but they're promoting the use of the handwritten word. People of all ages can benefit from practicing communication sans keyboard / touchscreen.
Combined with PostScan Mail, I think this postcard exchange could be very exciting. Imagine being at a grocery store when suddenly your phone beeps. You think it's regular text, but it's actually a notification telling you that you have 4 postcards in your virtual mailbox. Of course, you want to see those little guys in person, so you can have the mail forwarded to you wherever you are.