Flickr does this everytime you upload a photo. It has the camera model, date when photo was taken....everything!
Look at all the info it got from one of my photos.
Camera: Canon Digital IXUS 850 IS
Exposure: 0.05 sec (1/20)
Aperture: f/2.8
Focal Length: 4.6 mm
Exposure Bias: 0/3 EV
Flash: Flash did not fire
Orientation: Horizontal (normal)
X-Resolution: 72 dpi
Y-Resolution: 72 dpi
Software: Adobe Photoshop 7.0
Date and Time: 2007:08:12 14:56:56
YCbCr Positioning: Centered
Date and Time (Original): 2007:08:12 13:50:51
Date and Time (Digitized): 2007:08:12 13:50:51
Compressed Bits per Pixel: 5 bits
Shutter Speed: 138/32
Maximum Lens Aperture: 95/32
Metering Mode: Pattern
Color Space: sRGB
Focal Plane X-Resolution: 2844.444 dpi
Focal Plane Y-Resolution: 2840.237 dpi
Sensing Method: One-chip colour area sensor
Digital Zoom Ratio: 3072/3072
Compression: JPEG
Image Width: 480 pixels
Image Height: 640 pixels
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