MobilEaZe has released Pic2Post 1.0
( for the iPhone and
iPod Touch. It’s available for US$0.99 at the Apple App Store.

Pic2Post turns your photos into postcards printed on photo paper and
mails them to the recipients of your choice anywhere in the US. The
application leverages your existing iTunes account, which allows you
to purchase templates that can later be turned into postcards sent to
your friends and family for $1.99. Pic2Post is fully compatible with
iPhone OS 3.0, and the new iPhone 3GS.