According to Bluetooth.com -

Bluetooth wireless technology is a short-range communications system intended to replace the cables connecting portable and/or fixed electronic devices. The key features of Bluetooth wireless technology are robustness, low power, and low cost. Many features of the core specification are optional, allowing product differentiation.

The Bluetooth core system consists of an RF transceiver, baseband, and protocol stack. The system offers services that enable the connection of devices and the exchange of a variety of data classes between these devices.

Overview of Operation
The Bluetooth RF (physical layer) operates in the unlicensed ISM band at 2.4GHz. The system employs a frequency hop transceiver to combat interference and fading, and provides many FHSS carriers. RF operation uses a shaped, binary frequency modulation to minimize transceiver complexity. The symbol
rate is 1 Megasymbol per second (Msps) supporting the bit rate of 1 Megabit per second (Mbps) or, with Enhanced Data Rate, a gross air bit rate of 2 or 3Mb/s. These modes are known as Basic Rate and Enhanced Data Rate respectively.

So it is a secure wireless way to connect mobile phones, portable computers, cars, stereo headsets, MP3 players, and more.

Syncing my Treo 650 with my laptop also was simple to configure and is easy to do.

Using the Bluetooth modem built into my Treo on the other hand has been challenging to say the least. The couple of times I have got it to work, it has performance issues. Granted 60K is much better than nothing, but it is far less that what we are led to believe it should be.

One of my next additions may very well be a portable bluetooth printer. If you do any amount of traveling or spend any time on the road, bluetooth has the ability to make your life sooooo much simpler. I just can't wait until it gets there.

You can learn more about Bluetooth at www.bluetooth.com.