Need some example code to get you started? Have a look at these example Arduino v1.0 sketches.
OpenLog_Test_Sketch shows how to send large amounts of data and changing variables from an Arduino to OpenLog.
OpenLog_CommandTest will reset the OpenLog and send the commands to create a file called nate519.txt. This is useful if you need low level command control of the OpenLog (creating new files for example).
OpenLog_ReadExample shows how to create a random file on OpenLog, write some text and variables to it, then read it back to the terminal.