Dpi of digital photos not set to 72 (mac os is changing it?)

I'm certain that both of my cameras take images at 72 dpi. However, when I bring the photos into my mac, and view the info with Preview or with Photoshop, it says that photos taken with my Canon are 180dpi, and photos taken with my Nikon are 300dpi.
Now here's the strange part, when I view the photos with the GIMP (free image manipulation program) using X11, the GIMP says the photos are 72dpi. And when I view them under Linux, they are 72dpi.
And yet another strange thing -- when I view the photo in Safari or Firefox, it's the correct size (750px x 500px). In my past experience, if a photo was that size, but 300dpi, it would appear much larger on the screen, due to the fact that the screen's dpi is 72.
Is Mac OS changing the DPI?
Here is an example:
http://diary.00ff00.com/wp-content/photos/treefrog.jpg
Thank you!
PowerBook G4 12" Mac OS X (10.4.3)

Here's some great reading about digital photographs:
http://www.rideau-info.com/photos/index.html
Pay special attention to the DPI page:
http://www.rideau-info.com/photos/mythdpi.html

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