Creaking could be the start of radius arm bushings going, but I'd agree you should check out the ball joints since they do eventually go, and if you're still on the stock ones you might want to go ahead and replace them anyway.
The brakes sometimes creak if you don't lube up the caliper slides, and sometimes the anti-squeal/rattle clip either rusts or breaks, which can cause a click or creak sound. It's also possible the lug nuts are loose, or there is some other fastener which isn't as tight as it should be, including the wheel bearing retainer nut.
When you're replacing the pads is a good time to check everything else out and see what's up, but you may want to get under there with a flashlight beforehand and see if there's anything obvious so you can go ahead and buy anything else you'll need and do everything at once.
