I hadn't really noticed, but it turns out there are lots and lots of postcard apps in the App Store. It makes sense, the iPhone (and to an extent, the iPod touch) is a great virtual postcard device.

Freeverse Software on Thursday announced the release of Postman 2.0, an update to their iPhone OS 3.0 application for creating virtual “postcards.” It costs $1, and is a free update for registered ...