2007 apps look different because of the ribbon, but the keyboard can still be used to speed up tasks.
Microsoft has an online course that may help
After completing this course you will be able to:
Accomplish tasks by using sequential shortcut keys, known as Key Tips, shown on the Ribbon.
Navigate around the Ribbon using the TAB key and arrow keys.
Accomplish tasks by using key combinations — keys you press at the same time - exactly as you've done in previous versions of Office.