I'm glad this thread is up.
I had the same problem in PS Elements after I edited one my photos from iPhoto. I could not understand how the colours could be so different. It really irked me - but b/c this was the first time I had ever used imaging software I preusmed I had done something wrong.
It really is poor product quality control if the Preview app is screwing it up and "can't be trusted"!
I have no idea about different colour calibration stuff. I know that I just want my photos to have the same consistency with the original after they have been edited!