Entering a 40-bit encryption key into Apple AirPort software: this seemingly trivial bit of information is vital for intermingling Macs, PCs, and Unix boxes. Follow the link for the long answer; for experts: enter a dollar sign before entering the 10-character hexadecimal key.
Hitachi announces 2.4 GHz security chip: this story isn't quite what is seems by my headline. In fact, it's not related to 802.11b except by frequency. Hitachi has announced a tiny chip that can be embedded into money and other small, flexible packages, and that contains RF circuitry and 128 bits of ROM. The unit can transmit - ostensibly through passive transmission - over the 2.4 GHz band.