Basic Screen Capture Utility

I am in need of an application that will capture an element on the screen when clicked with a mouse. The application should: - capture to PNG or JPG files - capture only images or webcams - capture only the image area and not the containing window - be able to toggle capture mode on/off - when in capture mode, outline the object to capture with a blue highlight - timestamp the filename - set path in preferences menu - set preferred capture format in preferences menu - be light-weight... splash screen on startup, but other than that virtually invisible I am also interested in a Windows version of this software. If this can be done with Java to make it cross-platform, then I will consider it. Bonus points for being able to create this application in C# to run in the "system tray." Source code to be provided at project completion.