I've just installed the new version of Camera Raw 4.4 on my CS3 Suite.
Apparently all the ".NEF" files that I've tagged to process to ".JPG" have their "Date Picture Taken" changed. All of the photos in that particular batch process will end up having exactly the same "Date Picture Taken", date and time.
I reverted to the previous Camera Raw and ran the batch process again. This time the "Date Picture Taken" information was correct.
I use this feature a lot as it helps me to sort my photos according to the time and date that I took the pictures.