Locations of PowerPoint 2003 commands in PowerPoint 2007 : Slide Sorter

PowerPoint 2003 Location	PowerPoint 2007 Location
Hide Slide	Slide Show | Set Up | Hide Slide
Rehearse Timings	Slide Show | Set Up | Rehearse Timings
Summary Slide	Removed from product
Notes	Add notes in Normal view or double-click the slide that you want to edit.
Transition	Animations | Transition To This Slide
Design	Design | Themes
New Slide	Home | Slides | New Slide

Source: Microsoft (http://www.microsoft.com/)