I just got an Arduino Nano, for my birthday, and I can't figure out how to interface my PC to my it. Can I attach the data wires of a USB cable to it's RX / TX, or what?
Just plug it in. Or, don't you have a USB to mini-USB cable? If not, get one.
Err, it's an Arduino mini, sorry...It doesn't have a mini USB port.
Have you looked at this page, then?