The new SpyMeSat app for iPhone notifies you when an imaging satellite is overhead and could be taking your picture!
A nice map display shows and dynamically updates satellites orbit tracks and satellite position during flyovers, and a list below the map shows a countdown to upcoming satellite imaging passes. The user can drill down to see details of a specific pass and get a description of the satellite itself with a nice illustration. The user can configure notification settings, the look-ahead time, and even the image resolution range of interest.
Very cool new app!