Paste as Unformatted Text in Word and Office 2007

Yep - it's one of those features that you need multiple times a day, but Microsoft didn't manage to create a direct shortcut for it! Of course they did have time to come up with a shortcut to display the Research task pane (ALT+SHFT+F7) - that thing you didn't even know existed.
Anyway the good news is they did include the next-best thing - a shortcut to paste special. It's ALT-CTRL-v. From there you can reasonably painlessly arrow to the "plain text" option and hit return.
Another option is to write a macro to assign a key combination to paste as plain text, Microsoft Office Online tells you how to do it, but if you don't have the motivation to muck around with macros then go for the ALT-CRTL-v. It works on every computer and in Word/Excel etc with zero configuration.