You know I'm a fan of digital postcard services, so I did a little (discreet) dance when I found Postcard Express ($4) for my iPhone.
You can take a picture at whatever fabulously exotic location you're at, and then you add your message and the email address of the recipient. It'll even geo-tag your photo/postcard for you.
The finished product looks so much like a traditional postcard, you won't miss buying the cards and making sure you have postage.
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