I've been wanting this feature ever since I watched a video of TempleOS, which featured images in source code (everything is in "DolDoc" format: <a href="http://www.codersnotes.com/notes/a-constructive-look-at-templeos/" rel="nofollow">http://www.codersnotes.com/notes/a-constructive-look-at-temp...</a>). I'd love to be able to drop in diagrams, screen shots, and scribbles into the source code of my personal projects!