Bruce Schneier's Cryptogram

Bruce Schneier is the author of the excellent Applied Cryptography, which is still the best resource for information on cryptographic algorithms and security. He also publishes Cryptogram, a monthly newsletter which I can't recommend highly enough.

Each month you get Schneier's refreshingly acerbic and common-sense view on security stories that make the news. Even better, there are frequently links to 2600-like articles on things such as how to fool fingerprint security devices with fake fingers and latex prints, or how those cash machine card readers/PIN camera scams are implemented. Great fun.