Well, according to a report in this weekend's Observer newspaper, the Ministry Of Defence is interested in the technology that allows us all to be monitored by our mobile phones. Apparently, there are many positive uses of this 'spy' technology - following people on the move (walking or driving) and monitoring areas (nuclear power stations, roads etc.) when visibility is bad. Nobody seems to ask what happened if you loan you mobile 'phone to somebody or (gasp) switch it off. Observer: How mobile phones let spies see our every move