Jamie found a cool story at MIT Tech Review. (As an aside, it sits behind an interstitial ad AND on 2 pages: normally I reject websites that do that, but it's a slow news day, so I'm letting it through.) Essentially, software is used to analyze light patterns in still photographs. Once you can figure out where the light sources are, it becomes a lot easier to determine if an image has been photoshopped.

jason writes "YouTube has never really been known for streaming videos at a high resolution, but it appears that they are taking early steps at providing higher quality videos. The project was announced last year by the site's co-founder Steve Chen, and now appears to be in the earliest stages of deployment. By adding a parameter onto the end of a video's URL you're able to watch it in a higher quality (in terms of audio and video) that is actually quite noticeable. Not all videos have been converted at this point, but they do have millions upon millions of videos that they need to do."