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

EXCEL

• The familiar menu toolbar has been replaced by the ribbon toolbar: Rather than requiring the user to browse through several menu trees, the blue ribbon interface (which can be changed to either black or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
  
• Formula’s work the same but there are more options including:
  • More rows and columns, and other new limits
  • Office themes and Excel styles
  • Rich conditional formatting
  • Easy formula writing
  • Improved sorting and filtering
  • Excel table enhancements
  • New look for charts
  • Shared charting
  • Easy-to-use PivotTables
  • Quick connections to external data
  • New file formats
  • Better printing experience
  • New ways to share your work
  • Quick access to more templates

Click here for a list of new features in PowerPoint version 2007
Click here for a list of new features in Outlook, Word, & Access version 2007