A bit off-topic but because working with shortcuts is often so much faster.
I believe that shortcuts are are preferred when it comes to speed/productivity and reducing the chances on RSI.
Microsoft: List of keyboard shortcuts for Word 2002, Word 2003, and Word 2007
http://support.microsoft.com/kb/290938
Just in case you weren't aware, we have a list of the shortcuts in Excel listed too:
//www.asap-utilities.com/excel-tips-shortcuts.php
PS.
If you know the shortcuts for the tools you use the most, you are not slowed down by searching for the option in the new Office 2007 ribbon the first period after you have upgraded to the new interface.