Getting your events in Facebook into your calendar in iCal is pretty easy to do on a per-event basis. Just find the event in Facebook and click on the "export" button. When you do this, Facebook will create an .ics file and your browser will probably ask what you want to do with it. Choose the option to save it to a file. Once the file is saved, you can then double click on it and iCal will start and ask you which calendar you want to add this event to. Choose the calendar you want and it'll be imported into iCal. Doesn't get much easier than that. Now if there were only a way to do this in bulk...