Today, I've launch a native cocoa application were used to capturing screen in various way. The program name is Captur and runs on Mac OS X 10 or Later (Intel).
This program use the screencapture, a command line application for capturing screen on Mac OS X. Since command line program is not friendly with end users, this application make the short way to do it. Many thanks to Yves Kaiser for the idea and for the German and French translation. This version is free and still in development for the next version.
See the application page and enjoy.