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I got interested in photo forensics when people were posting alleged damage caused by a product I sell on user group forums. Knowing that it was mechanically impossible I hired the company in below link to analyze them and they proved they were digitally manipulated.

http://www.fmsconsultation.com/

What’s interesting is that of you change even one byte on a picture it makes multiple changes elsewhere in the file and they have multiple filters to detect these changes and it is virtually impossible to totally fake a picture and go undetected.

Read their paper on audio analysis it is awesome. They can tell you the exact time of the audio recording and what part of the country it was recorded even from a battery powered device that is off the grid.

It is surprising how many photos are doctored, like you may see a photo of Fidel Castro in good health reading a current newspaper - run it through Error Level Analysis and you find the newspaper was photo shopped in.

another site that has some interesting analysis

http://www.hackerfactor.com/blog/index.php?/archives/545-Starring-Morgan-Freeman.html

http://www.hackerfactor.com/blog/index.php?/archives/102-Rachael-Ray-enstein.html

Another site that has some plugins you can run on some graphics programs like Gimp and Photo shop.

https://sites.google.com/site/elsamuko/forensics