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Image Sensor Type Used in... Width Height Diagonal mm Focal Length Factor Area
(some examples, not meant to be a comprehensive list) mm mm (equals 'normal' lens focal length) mm**2
1/4"   3.2 2.4 4 11.3 7.7
1/3.6"   4 3 5 9 12.0
1/3.2" Canon A100, A200 4.5 3.4 5.7 7.9 15.3
1/3" Nikon Coolpix 100, 300 4.8 3.6 6 7.5 17.3
Casio QV-8000SX
1/2.7" Nikon Coolpix 2500, 3500 5.3 4 6.6 6.8 21.2
Sony DSC-P31
Pentax Optio 230, 330GS
Canon A40
Olympus C-730
Minolta Dimage X, Xi
1/2.5" Olympus C-740, C-750          
Ricoh R3, R4, R5
Canon SD700, SD800
1/2" Nikon Coolpix 950 6.4 4.8 8 5.6 30.7
1/1.8" Nikon Coolpix 995, 4300, 4500, 5400 7.2 5.3 8.9 5 38.2
Canon Powershot G2, G3, G5, S30, S40, S45 , SD900
Kodak DX3900, 4900
Pentax Optio 330RS, 430RS
Olympus C-5050, C-5060, C-8080
Ricoh GR-D, GX8
1/1.76" Leica Digilux 1 ? ? 9 4.7  
Panasonic DMC-LC5
2/3" Nikon Coolpix 5000, 5700 8.8 6.6 11 4.1 58.1
Sony DSC-F717
Minolta 7i, 7Hi
1"   12.8 9.6 16 2.8 122.9
4/3" Kodak-Olympus-Fuji-Panasonic-Sigma new digital standard. This system uses the same standard lens mount for any brand camera and lens. 18 13.5 22.5 2 243.0
Maybe this is the digital system for the future.
First model is the Olympus E-1 with the 5 megapixel chip as displayed above. Second model is the Olympus E-300 with an 8 megapixel chip also made by Kodak. Now also E-500, E-330 and E-400.
Visit the 4/3 site for more information.
  Canon D30, D60, 10D 22.7 15.1 27.3 1.6 342.8
  Nikon D1, D1H, D1X, D100 23.7 15.6 28.4 1.5 369.7
  Pentax *ist D 23.5 15.7 28.3 1.5 369.0
  Canon 1D 28.7 17.8 33.8 1.4 510.9
APS Advanced photo system film cameras (various crops in camera) APS-H here at 16:9 ratio 30.2 16.7 34.5 1.2 504.3
35mm 35mm film cameras. 36 24 43.3 1 864.0
Full frame digital SLRs such as Contax N, Canon 1Ds, Kodak DCS14n
645 Medium format 120 roll film 56 41.5 69.7 0.6 2324.0
Stolen from http://homepages.tig.com.au/~parsog/photo/sensors1.html