The project which is hosted on ‘trainwatch.u0d.de‘ is keeping track of Dutch intercity trains which provide free and public WiFi.
The information which can be found on the website shows ‘classified’, yet public information which has been collected from Public WiFi hotspots in the Dutch intercity trains.
I think that the website trainwatch.u0d.de is an perfect example on how ‘easy’ it is for criminals and hackers to obtain personal information via public hotspots. His system shows that there’s no such thing as privacy on public hotspots.