Jumpman
A platform game with a twist. Play it and see. Surprisingly intuitive and utterly addictive.
Link archive: February 22nd, 2009
Busker Du
Busker Du (dial-up) is a recording service for buskers through the telephone (preferably public payphones hidden in subway stations).
Welcome | The Signtific Lab | Massively Multiplayer Thought Experiments
An even more speculative version of The Long Bet. Given a supposition (e.g. "What will the world be like when custom satellites are as easy to design and launch as your own website is today?"), you can add to a list of positive and negative outcomes.
theunbook.com
An approach to releasing community-driven books that is more like software than traditional book publishing. Think versions instead of editions.
Wiki Paths
A greasemonkey-driven hypertext game: get from a starting Wikipedia page to your target solely by following links in the articles.