Either way it's fun to think about.
I got an app for my phone called Ghost Radar. Basically it uses the sensors in the phone to search for 'ghosts' and channels words from them through the speaker.
Apparently there are many spirits living in the electrical conduit in most walls and under power lines.
There's usually a convention of them around microwave ovens.
It's a nicely designed program and looks good on screen. http://www.androlib.com/android.screens ... wDq.u.aspx