A short comparison between ZigBee and Bluetooth. Also a mention of the ZigBee-based Java physical computing modules from Sun Microsystems called the Sun SPOT.

I discussed the built-in 4 channel ADC in the ZigBee modules sold by Sparkfun and the pro version of their module with greater power and range.

I suggested that the newer protocol options in Bluetooth to support UWB and isochronous options may result in better performance than ZigBee.