I dont know if this has already been discussed, but i stumbled upon this: http://www.amarino-toolkit.net/index.php

I think its a cool project! Would anyone be interested in doing something similar for maemo?

I am a bit disappointed that this is the only mention here of Amarino considering that Maemo and Arduino(with Bluetooth added) are both open source hacker projects.
I am not sure what I would use it for yet, but it would allow us to use a phone to control anything from simple robots to appliances to automotive sensors and circuits via bluetooth.