I've been building a website for a guy who uses Mac OS X and occasionally he sends me screenshots of bugs. They come out looking like this:

This is fairly typical of Mac screenshots. You get the window decorations, the shadow from the window and a white or transparent background (not the desktop wallpaper -- I've checked).

Compare this to an Ubuntu window-shot (Alt+Print screen):

It's impossible to keep a straight face and say the Ubuntu one anywhere near as elegant.

My question is: Is there an application that can do this in Ubuntu?

Edit: Follow up: Is there an application that can do this in one move? Shutter is pretty good but running the plugin for every screenshot is pretty tiresome as it doesn't seem to remember my preference (I want south-shadow and that requires selecting south, then clicking refresh, then save) and it's more clicks than I'd like.

Is there a simple way of telling shutter I want south-shadow for all screenshots (except entire desktop and area-selection)?