The Lair of the Marrow Monkey is a work of genius. While the interactive fiction I've mentioned before has to do with immersion of the player through interactivity with the story itself, Marrow Monkey seeks immersion of the player through interactivity with the way the story is told. Mind-blowing insights into interactivity abounds, from the original interactive multimedia extravaganza Lair (1998) to the seven chapter and counting interactive story Chroma (2001) to supplemental interactive essays and other works. Make sure you have your speakers or headphones on, the Flash plug-in installed, and don't be afraid to move your mouse.

The site and other projects by the same author(s) have been around for a while and have already won appropriate awards, but as this is the first I've seen of it, I have to mention it now.