Originally posted by mattt IMO, leaving Kr in ISO 200 negates one of the greatest feature of this camera, and will cause undesirable slow shutters to become a problem in low light situations.
I'll respectfully disagree with the first part of your statement, but the second can be true. I'm not advocating that the required balance for a good exposure be ignored. I'm saying that by keeping the ISO low by default, you (if you're paying attention) will know pretty quick when there's no other way to get a suitable shutter speed, and can bump it up manually for that shot.
I found my K-r using ridiculously high ISO levels in broad daylight, just because it could. It would set the shutter to 1/1000 second, totally unnecessary for shooting what I was (immobile plants and such), and introducing totally unnecessary noise in the process. After a few sessions of this I said to hell with it, I know better than the camera what ISO I need, and I know my preference towards keeping it as low as possible - hence, defaulting it to 200, and increasing it sparingly if needed.
That said, I'm shooting mostly daytime stuff in adequate light these days, or at night with a flash, so I can also see how my plan wouldn't work for a lot of people, who may shoot primarily in dim light.