capturing audio from mixer

I was wondering what kind of software (Audacity, Logic, Garageband?) and hardware (not too expensive...) I could use to capture audio from an audio mixer. I don't have the exact name of the mixer at hand (we're using an alternative to our GL2400). I don't usually record audio, I just mix and such, so thanks for the help.

 

yeah, I knew about my line-in port (I've wanted one for ages.. the iBooks really needed them!) but what kind of device would you recommend for the capturing? I've seen people do it by using a cable (I can't remember the name-- help?) with one end like a headphone jack and putting that into the monitor port on the mixer and then the other end is a line-in which goes to the computer..