Only Bluetooth ports listed under Tools

I am an absolute beginner, just starting with an Arduino Duemilanove (AT Mega 328P-PU chip).
I have installed the latest software on my MacBookPro.
When I try set up the serial port I can only see bluetooth ports:
/dev/tty.Bluetooth-PDA-sync, /dev/cu.Bluetooth-PDA-sync, /dev/tty.Bluetooth-modem or /dev/cu.Bluetooth-modem.

None of these work. I get the following error when I try to upload the Blink example sketch.

avrdude: stk500_recv(): programmer is not responding

What am I doing wrong?

pnev

Did you installed the FTDI drivers for MAC?
http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_18.dmg