Installing an Internal Bluetooth Module
One thing that the Acer Aspire One lacks that most other netbooks include is an internal Bluetooth module. The very handy netbook hacker ‘tnkgrl’ has provided very detailed instruction on how to install an internal Bluetooth chip in your AAO.
The process requires intermediate soldering skills as some of the points are very small. You will definitely need some type of magnifying glass to make sure that your soldering points are strong and accurate. One of the downsides to this mod is that you can’t turn the Bluetooth off, unless you disable it in the control panel. I’ve noticed that I get almost half an hour less now that I’ve installed this mod than I did before, so you may want to consider just using a micro external dongle that you can pull out when you’re not using it. The disadvantage to the external Bluetooth is that it will take up one of the three USB slots, stick out about a quarter of an inch, and isn’t as cool. It really comes down to how frequently you require Bluetooth.
check out the step-by-step instructions here:
http://tnkgrl.wordpress.com/2008/08/14/modding-the-acer-aspire-one-bluetooth