I've just bought the application from the Apple store. No cams appear on map though -here in Greece. I see though cameras in e.g., London.

Note that when you "check" the map that is embedded on site (http://njection.com/speedtrap/)... lots of cameras appear!

I'm acutally having the same issue.  I'm not sure if the iPhone app is acutally conected to the website or not, but when I look on the website's map, I see dots, but on my iPhone I don't.