Examples of Datalogging on Arduino
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There are several ways to save data from a sensor attached to an Arduino.  If you're connected to a personal computer, you can simply send the data from the Arduino to the personal computer serially, and save it to a file.  If you've got an SD card attached to the microcontroller, you can save the data to the card. Or, if you have access to the internet and a device that can connect to a server, you can save the data to a server. In these, you'll read a DHT11 temperature and humidity sensor and log data in three ways:

* Serial transmission to a personal computer, and serial capture to a file.
* Saving data to an SD card mounted on the Arduino
* HTTP upload to pachube.com via an Ethernet shield or Ethernet Arduino.

For a full tutorial see http://www.tigoe.net/pcomp/code/?p=1043