postcard from a friend or loved one is always a treat. My parents always send a postcard to the kids when they go on vacation. The kids love it.
How fun would that be? Whenever I wanted to drop a friend a note wishing them Happy Birthday, or Thank You, or whatever other personal message I wanted to send, I could make it personal by sending a postcard that I created. I think this is a much better gesture than the Facebook Happy Birthday message. It says "I knew your birthday was coming up and I sent you this message because I'm thinking of you", not "Oh I noticed everyone wishing you a happy birthday on FB and thank goodness, I would've forgotten."
I also think that this would be a great business alternative. As an Editor with US Family Guide, I could really get my information out to businesses with a catchy postcard and all my sites info, as well as my contact information. There's something about a postcard that is just so much more intriguing than a letter...don't you think?