I calibrated for a darker room environment.
With this set you are very unlikely to get an accurate picture that is bright enough for a heavily lit room (and with the relectivitiy of the screen this is not a good set at all for that type of environment), but I have had no issues with my settings with moderate lighting.
Being a budget plasma, it simply cannot output enough light for certain viewing conditions and still keep the picture accurate, and accuracy is what I was going for with my calibration. My settings are plenty bright enough for a darker room.
As for the yellowish tint that you noticed (from your PM), I'd chalk that up to panel variance. Every TV is different. I cannot garrantee that my settings will look good for everyone, but I thought I would share them anyway.