Reading View in PowerPoint 2010
Reading view is new to this version of PowerPoint. It is similar to slide show view. The difference between the two views is that while slide show view takes over the whole screen, the slide in reading view is also shown in full screen, but you will also see the PowerPoint title band at the top of the screen and the PowerPoint status bar and the Windows task bar displayed at the bottom of the screen. The ribbon and the slides/outline pane are no longer visible.
Reading view is useful to quickly navigate the slide show, but have easy access to the Windows task bar to switch to other available open programs or windows.