Agree with the comments about Bridge being unnecessary. But I am not certain I understand - or, if I do understand, don't agree - with the comment about using the "Save" command. In most cases, I want to keep both the original AND the edited photo.
When editing a RAW image in CS2 or elements, I prefer to "Save as" into a working folder, them import the edited photo into iPhoto; that way, I don't lose the original and both are visible in the iPhoto viewer / editor.
Well, it seems that you are doing fine, because what you don't want to do is to alter the original RAW image. PSE6 and CS2 don't mess around with the original file, and that's a good thing. So "Save As" is the way to go.
Now, I will try to explain the "other side" of the same issue: when using iPhoto, you will notice the icon "Edit" at the bottom of the window. If you select any of the photos and then click on "Edit," iPhoto launches whichever editing application you have set in the iPhoto's Preferences. If you have set iPhoto to launch PSE6, or CS2, or Graphic Converter, etc., then that application will launch. More than likely the image to be edited is not an original RAW image, but a JPEG copy of it. If the photo you have decided to edit is a RAW image, it's a good idea to Save As. However, it you look at the iPhoto window in detail, you will notice that you have the following:
-Events
-Photos
-Originals, and so forth...
The photos you see in the window are not the original photos, but JPEG copies of the original photos. It's a good idea to work with the JPEG images and leave the "Originals" alone. I just copy the original photos to a CD or hard drive, and work on copies of it. From RAW I save to TIFF or PSD sometimes, and then to JPEG for posting online, e-mailing, etc.