Originally Posted by ucv.karl

They were exported directly from QuickTime. The source material was HDV 1080i, so you have to manually find frames where the everything is in focus (or as close as possible) and the motion is minimized and export those frames (this is horribly tedious, but necessary to get the quality). Then deinterlace and use a little sharpening in photoshop. Also, to make things a little bit quicker, an applescript was used to avoid using any of QuickTime's 'export frame as menu', or having to explicitly specify the file name of the image. So the workflow is: open up the source footage, use the scroll on the mouse to find good frames, then execute the applescript. Repeat.....

It's horribly tedious and boring, but the quality is worth it.

Here's another example and there's more here.

Another example and a few more. They're pretty good for screencaps.