Well, looks like I've got yet another problem with my system, and I've got a question about it. There is some kind of static or other graphical defect that happens in most games, usually when special effects like wind and fog happen but it shows in other places as well. It's kind of difficult for me to explain, but it looks something like the problem in this video I found:
http://www.youtube.com/watch?v=sJNMO9PALZ8It started small and so I just let it go, but it's been getting worse and becoming distracting. I have a feeling that eventually it is going to stop working. To make sure that it is the system and not the TV, I tried it on another TV and also using a different cable, and got the same result.
From what I can gather, this is a problem with the GPU. So my question is to people who have experienced this issue themselves and sent it in for repair: did you keep all of your data? If there's a risk the data will be deleted (or if doing so is a part of the repair process), then I'll probably just ride it out and see how much longer it lasts.