Top new features of powerpoint 2007
(Taken from Microsoft.com)

POWERPOINT

• The concept & functionality of PowerPoint has not changed, but the menu toolbar has been replaced by the new ribbon interface: Rather than requiring the user to browse through several menu trees, the blue ribbon interface (which can be changed to either black or silver) arranges all of its options under a few basic tabs; clicking a tab brings up a selection of related tools
• The Broadcast feature is removed from Microsoft Office PowerPoint 2007.