I know that the fanmade game Residence 44 Quest (which should have a link on Nick's Link page) used strings that you put in before starting the game. From the code that I remember, the information you put in was stored in strings and was recalled when needed throughout the game.
For instance, you're prompted for your name, degree, and favorite beer type. Depending on what type of beer you put in (it must be Heineken) the lazy tall guy would compliment you on your choice of beer, otherwise he would just say "Heineken rules!".
You could go further with this, and possibly develop whole subplots based on what strings you put in. Of course I'm talking about a ridiculous amount of work in your coding, but just imagine what kind of a game that would be!
Adam