Below are reported a (not completed yet) list of shortcut keys for Microsoft Word.
I’m going to extend the list whenever I’ll find a usefull shortcut for a new functionality.

Word

Function Shortcut Key Reference
Strikethrough http://word.tips.net/T000418_Strikethrough_Shortcut_Key.html
Current date Alt + Shift + D
Current time Alt + Shift + T

Excel

Function Shortcut Key Reference
Current date Ctrl + Shift + ;
Current time Alt + Shift + :