A very well designed free tutorial series on building websites starting with the basics.
Closest thing out there to a real jetpack.
Elon Musk's next project appears to be building tunnels under LA so he doesn't have to sit in traffic anymore.
Examples of "real world" applications build with a variety of technology stacks.
A very cool demo of a visual programming language called Subtext.
Hypercard was a visual programming tool built at Apple in 1987 for organizing and automating everything you do on your computer.
A visual programming language, similar to Max MSP, for creating music. It has a really cool UI that works across all platforms.
Another version of Subtext that demonstrates how "good notation is half the problem".
An interesting idea providing a nice UX for online discourse. I'm not sure it will ever work, but its a cool idea!