With the latest Safari browser version 5.0.1, you can download extensions to add features to it. One of these is Exifext. After adding this extension, you can right-click and read the exif data of pictures posted on the web. I have this on my Mac and it works. Great for a quick peek on the setting used in some of the spectacular photos posted here in CS.
I have not updated Safari on my PC yet so I do not know if this work in the same way.