Without thinking about compatibility, I went and bought a CA-42 USB cable to connect my phone. Apparently Nokia only offers a driver for Windows. Whoops.
I successfully managed to google one for OS X, but now I'm not sure what application to use to connect with the phone. I tried using a shareware app called OnSync, and that didn't connect.
Can I find something that will do this, or would I be better off just buying a bluetooth adapter and using iSync?