Geek Train to JAOO

I am on my way to the JAOO conference in Aarhus, Denmark with a colleague. We booked a late train and ended up on a geek train!
Addicted as we are, we logged on the Internet via our mobil phones and noticed that we were not the only ones with Bluetooth enabled laptops/mobil phones!
This was what we say.

Bluetooth

That is pretty amazing as Bluetooth is a personal network and the range is about 10 meters.