If you have an AOL Instant Message account, apparently you can put it to good use by playing classic Infocom text adventure games like ZORK. Man alive, did I ever NOT need to know about this. And now I have a hankering to play Colossal Cave, too....and all those bare-bones, but still entertaining, Scott Adams text adventures.
(If you like graphical adventure games like MYST, and you've never tried their text-based forebears, then what are you waiting for? Just don't start with Suspended. That game will make you want to kill people. Trust me.)