Bluetooth
Hackers in Residence - Hacking MindWave Mobile
Review, teardown, and hacking tutorial for the MindWave Mobile, a $99 commercial grade EEG sensor.
Understanding the BC127 Bluetooth Module
SparkFun has two boards using the BC127; here's what you need to know to use them.
Using the BlueSMiRF
How to get started using the BlueSMiRF and Bluetooth Mate Silvers.
RN-52 Bluetooth Hookup Guide
A hookup guide to get you started with the RN-52 Audio Bluetooth Module Breakout Board.
Bluetooth Basics
An overview of the Bluetooth wireless technology.
MetaWatch Teardown and Arduino Hookup
Tearing down the nifty Bluetooth-enabled MetaWatch. Then building an Arduino sketch to control it.