What does your smartphone say behind your back?

I stumbled across this interesting link in the NANOG list traffic, and thought I would share it. The folks behind the pcapr project have developed a tool to analyze which smartphone apps are saying what to whom. The instructions here are not for those of low geek quotient, and sadly it's a Mac-only tool at present, but I expect we might see some interesting analysis coming out of this if enough people take part and share their results.