One trick pony, but it's a swell trick. Very convenient to keep in dock for lightning quick image down-sizing. While the quality of the scaled image is less then perfect (it ain't no photoshop), this app is free, so no real complaints there.

There is one annoyance, however, that will prevent me from using this app on a regular basis. The program has a habit of putting white filler to the right or below the image in order to pad the final to a fixed aspect ratio. In other words, if you drag in a rectangular image, the 'postcard' in generates will be more squareish with your image on top, and white filler on the bottom. It that problem goes away, it will remain on my dock for a long time to come.