What would cause a creaking noise while steering?

A few things to look at: bad struts, dry ball joints (can you grease 'em?) Check tie rod ends (grease?). How are the rubber bushings? Also, check Power Steering lines and pump (plenty of fluid?). Also, get a friend to bounce the car up and down while you or somebody moves the wheel around. Might take three people to do this. One bouncer, one steerer and one looker. Sounds like a party to me.