I used a hex editor to find evidence of a 'conspiracy' hidden in these files. Here's what I found:
http://www.panoramio.com/photo/3189237 :
-Equipment Make: Canon
-Camera Model: Canon PowerShot S70
-Color Representation: sRGB
-Shutter Speed: 1/251 sec.
-Lens Aperture: F/5.6
-Flash Mode: N/A
-Focal Length: 6 mm
-Exposure Time: 1/250 sec.
-Metering Mode: Pattern
-Exposure Compensation: 0 step
-Date Picture Taken: 12/29/2005 11:02 AM
(copy-paste address)
http://lh5.ggpht.com/_xNG6OpukfNM/RmYorw2zmiI/AAAAAAAABv8/Je6xCM8r110/Straddie+Adventure+311.jpg :
-Equipment Make: Canon
-Camera Model: Canon PowerShot SD630
-Color Representation: Uncalibrated
-Shutter Speed: 1/1244 sec.
-Lens Aperture: F/2.8
-Flash Mode: N/A
-Focal Length: 6 mm
-Exposure Time: 1/1250 sec.
-Exposure Compensation: 0 step
-Date Picture Taken: 6/3/2007 8:44 PM
(copy-paste address)
http://lh3.ggpht.com/_OX9rvdDKdks/RsVEjkknyyI/AAAAAAAAA4Y/KbHdVOj_MJs/IMG_1945.JPG :
-Equipment Make: Canon
-Camera Model: Canon EOS DIGITAL REBEL XTi
-Color Representation: Uncalibrated
-Shutter Speed: 1/250 sec.
-Lens Aperture: F/10
-Flash Mode: N/A
-Focal Length: 21 mm
-Exposure Time: 1/250 sec.
-ISO Speed: ISO-400
-Exposure Program: Unknown
-Exposure Compensation: 0 step
-Date Picture Taken: 8/9/2007 7:49 PM
(copy-paste address)
http://lh6.ggpht.com/_BdQessh4RZk/Ry2y7sE6alI/AAAAAAAAAiI/QUbA4lh4T78/P1000563.JPG :
-Equipment Make: N/A
-Camera Model: N/A
-Color Representation: sRGB
-Lens Aperture: F/8
-Flash Mode: N/A
-Focal Length: 5 mm
-Exposure Time: 1/125 sec.
-ISO Speed: ISO-100
-Exposure Program: Normal
-Exposure Compensation: 0 step
-Date Picture Taken: 7/22/2007 8:56 AM
http://www.matthewclement.com/gallery/Concorde_01.jpg :
-Equipment Make: OLYMPUS OPTICAL CO.,LTD
-Camera Model: C2100UZ
-Color Representation: sRGB
-Lens Aperture: F/8
-Flash Mode: No flash
-Focal Length: 12 mm
-Exposure Time: 1/500 sec.
-ISO Speed: ISO-100
-Exposure Program: Aperture Priority
-Exposure Compensation: +0.3 step
-Date Picture Taken: 6/28/2002 1:22 PM
(copy-paste address)
http://lh4.ggpht.com/_K2NQhkqWYkA/RyZTdRTkO7I/AAAAAAAAAdA/HcInH74O5mU/Sunrise+behind+Twin+Sisters+1.jpg :
-Equipment Make: NIKON
-Camera Model: E4500
-Color Representation: sRGB
-Lens Aperture: F/2.6
-Flash Mode: N/A
-Exposure Time: 1 sec.
-ISO Speed: ISO-400
-Exposure Program: Normal
-Exposure Compensation: 0 step
-Date Picture Taken: N/A (Date not set on camera)
(copy-paste address)
http://lh4.ggpht.com/__9WKAh9yusI/SAVduVh5r3I/AAAAAAAAG0M/2XGsxAHPdmU/P1030614.JPG :
-Equipment Make: Panasonic
-Camera Model: DMC-FZ7
-Color Representation: Uncalibrated
-Lens Aperture: F/5.6
-Flash Mode: N/A
-Focal Length: 6 mm
-Exposure Time: 1/400 sec.
-ISO Speed: ISO-100
-Exposure Program: Normal
-Exposure Compensation: 0 step
-Date Picture Taken: 4/14/2008 3:32 AM
The others contained no camera information, because they were clearly cropped or resized and saved in a different format. Nothing suspicious really.