Nick Lott have been working on datalogger based in AVR butterfly kit. Data-logger is used to monitor environment parameters like temperature, light, voltage, and values from other sensors connected to other inputs: ADC, timer counter. Author wanted to make this project more universal that it could be used in variety projects like weather station, motion-recording with accelerometers, etc.
Datalogger can be configured wia RS232 interface with specially developed queries. With RS232 and joystick you can adjust various logging parameters like logging time intervals and so on. Data is logged to flash memory which contents may be viewed later for instance as graphics. Good ting that project software is open source what allows you to use and change code for you needs.