Larry Osterman's posted about Easter Eggs in old versions of Microsoft software, and can be found here.
Brought back vivid memories of the recovery command, thanks Larry!
Loads more Microsoft Easter Eggs can be found here but in recent years Microsoft will happily shoot any coders found making Easter Eggs in their products so sadly no more.
I spent many an hour when I was coding adding Easter Eggs to my creations, one program I wrote an egg that made an Imperial Star-Destoyer appear and majesticaly go across the screen to the tones of the Imperial march playing out of the tiny PC speaker, that usually goes beep when you switch the machine on. The reason why is because I felt I was working for a company that was more like the Empire out of Star Wars.
So have you ever written any Easter Eggs, drop me a feedback (remember not to put even the hint of a URL in there because the comments system won't take them)