Mac OS X only: Freeware app InstantShot is a menubar app that takes screenshots of your Mac desktop, windows, or selection, and saves them in one of three formats. Macs come with decent built-in screenshot capabilities (Cmd-Shift-3 for fullscreen, Cmd-Shift-4 for selection), but it's relatively limited. However, InstantShot's different outputs (.jpg, .tiff, and my favorite, .png), its pixel-specif