Well, I'd take a look inside the wheel well and see if there's anything noticeably bent or broken. If you wheels are cambering a lot, then it's not just the tie rods. When you turn the steering wheel so the car goes straight, are the wheels actually straight or are they toeing in/out? If they are toeing, the combination between the toe and the camber will wear you tires out fast. My best guess is that you hit a really big bump and bent your frame/suspension links. If it's the links, replace them. If it's the frame, you'll probably need to take it to someone to get it fixed.

-Joel