Bruce Schneier, the author of several books on cryptography, the founder of Counterpane Internet Security, Inc., and the creator of the Solitaire encryption algorithm presented in Neal Stephenson's novel Cryptonomicon, has launched his own web log!
Bruce has been publishing a newsletter known as Crypto-Gram (which will still be available as a monthly e-mail newsletter) whose contents will now be available as he creates it on his new web log, Schneier on Security.
George and I read Cryptonomicon, and became interested in cryptographic methods (we actually carried around a deck of cards each for encoding/decoding messages for a while). I even presented a contest on this site where the readers had to decrypt a message using Solitaire to win a copy of Cryptonomicon, but it turns out I botched the encryption...
Check out Schneier on Security.