WindowClipMBI

WindowClipMBI is a menu-bar application for creating clipboard snapshots of the windows in any application, for any application, and more.

Features include: scaling, composite, trimmed composites, filter effects, and timed shots. Using its special features, WindowClipMBI can create screenshots which are not possible (or not as easily) with other methods.
Use the preference window, or the menu itself, to specify various options such as: scaling, reflections, showing cursor in screen shots, include Desktop windows, ignore framing effects like shadows, and creating an opaque image.