If you have ever thought about taking some arial photographs this site describes two versions that is sure to give you some ideas for your own.

"The outputs from Air Pressure, Temperature, Wind Speed, and Battery Voltage Sensors are feed in to the inputs of a PicAxe 18X. It Processes the raw sensor inputs, and then triggers the Camera (using a Servo) and Transmits the Raw Data. A Receiver captures the Data, converting it to a RS-232 Data Stream. The Data Stream is feed in to a Laptop that Archives the Raw Data, Filters and Decodes the Data, Archives the Decoded Data, and Displays the Decoded Data on the Screen."