Wouldn't it be cool if a general site about video games, like Joystiq or 1UP, was a video game in its own right? In other words, the graphical elements on the site, text elements, etc, in addition to providing you with the contents and navigation as you would expect, were also pieces of a puzzle game, such as Myst, or a casual game, or an adventure game.
Any sites like that, yet? If anyone want to develop it (out of my programming league) I've got a few dozen dozen ideas on how to do it. Free for the taking.