Tuper Tario Tros. — Mario meets Tetris mashup, with a challenging ending
CrowdsMachine — find popular links across all your feeds, and surface a new feed of the results
Alma — haunting short film by a Pixar animator, only viewable for a short time (via)
Multiplayer Basketball — even a simple basketball game becomes compelling with multiple realtime players
_why's Estate — an archive of artist/coder _why the lucky stiff’s known works (via)
Browser Pong — only works in modern browsers, uses HTML5 audio
OK To Go — a collage of hyperspace scenes in film (via)
Google Browser Size — this would be great for Analytics, to view your community’s actual screen sizes