It would be really cool if digital cameras could digitally sign the pictures they take. I'm not sure how feasable this is to do securely since the private key for the camera would have to live in some form on the camera. Even if hardware modifications would be needed to extract the key, that would probably be enough for most use if the camera were tamper-evident.
This might improve the admissability of digital photos in the courtroom. It might also make it easy for editors to avoid the recent LA Times photo that was doctored. For photojournalists one would probably want a wrapper format that included the full, signed image, along with cropping and color correction information.
I'm quite impressed with MichaelCrawford's Living with Schizoaffective Disorder article. I have had some experience around someone who was mentally ill; seeing someone smart and rational discuss these issues publicly is a great step towards destigmatizing this class of illness.