4dsystems udrive and Arduino datalogger

Does anybody know how to log data using 4dsystems udrive-usd-g1 microsd microdrive with arduino duemilanove?

it says it has a ttl serial interface, so you should be able to just send it data via the arduino serial ports (or soft serial) and access it

That's actually a interesting gadget, and at only 30 bucks ... well considering what it does that's ok i guess

So how do i create a file on the sd drive that I can read later on the computer, use Serial.print commands, I just need a start to go off on, i'm completely lost right now.