Here's some additional information obtained after further investigation.
I edited a .NEF file from Adobe Bridge using Camera Raw 6.2, then saved the file. I checked with Windows Explorer to see that the file modification date and time reflected the current time -- they did. Then I viewed the file in PSE 8 Organizer. The file did not reflect the changes so I updated the thumbnail. That made it clear that changes had been made, however, but there was a noticable difference between the renderings of the image in the two applications. Colors appeared more saturated in the PSE displayed version.
I've also tried to update the PSE 8 Camera Raw plug-in from the distributed version 5.5 to the current version 6.2 but was not successful. The online instructions don't seem to address all the fine points of making that work on a Windows 7 64-bit system.
Another less serious issue is that tags and captions don't seem to be totally mobile between the two applications.
This forum is for www.photoshop.com (the online portal for images).
For a speedy response, please repost your question about Bridge here: http://forums.adobe.com/community/bridge
and for PSE, post here: http://forums.adobe.com/community/photoshop_elements