This is really just a lot of links to projects, tools, games, and any other things I'd like to publicly bookmark. Hopefully it will prove useful to at least one person other than myself.

Programming

Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML. (The source for this page is written in Markdown)

CypherSaber - A perfect entry-point into the world of cryptography. Every new programmer should craft their own 'CypherSaber'.

Security

Diceware A great offline and secure method for creating passphrases.

Podcasts

No Such Thing as a Fish A weekly podcast in which The QI researchers share their most interesting recent discoveries.

Freakanomics Radio is an award-winning weekly podcast where host Stephen Dubner has surprising conversations that explore the riddles of everyday life and the weird wrinkles of human nature — from cheating and crime to parenting and sports. Dubner talks with Nobel laureates and provocateurs, social scientists and entrepreneurs.

Flash Forward is a podcast about the future. Each week we take on a possible future scenario — everything from the existence of artificial wombs, to what would happen if space pirates dragged a second moon to Earth.

The Infinite Monkey Cage is a witty, irreverent look at the world through scientists' eyes with Brian Cox and Robin Ince.

In Our Time, a weekly BBC Radio4 podcast where Melvyn Bragg and guests discuss the history of ideas.

Bitcoin Games

Chopcoin - Highly addictive multiplayer game faucet.

Android Apps

AntennaPod - A great open source podcasting app with a simple and clean interface.

Web Services

Pocket - Bookmarking service able to sync between multiple platforms.