Mine makes this knocking/creaking sound also, especially when going over speed bumps or going over the curb into my driveway. It sounds like something is loose.
I replaced the end links last year and this had no effect on the problem. I inspected the sway bar links and they looked OK. Also at this time I replaced the axle assemblies and the control arm bushings were tight.
I suspect it may be the struts. The car has 107K and I guess its about time to change them.
PS - this post belongs under the suspensions threads.
