Just came across this on HN and it looks incredibly exciting - a feature in the upcoming version of Photoshop that allows you to fill spaces seamlessly and intelligently. The video highlights using it for removing unwanted artifacts (instead of using the spot healing tool) and patching large chunks of an image. It looks like it can be a bit CPU intensive when calculating larger areas, however achieving the same effect manually would take much, much longer.
Update: New Video!
Here is a new video of the new Content-Aware fill that just surfaced on YouTube (thanks Matt!):