A time-lapse video posted by YouTube user lorien1973, who says:
This is the digg spy that is watching the new stories pages. You can view it from the digg labs at bottom of the page. It was especially chaotic last night.
In the first part of the video, the big dots are stories being submitted. The yellow dots that attach to them are people "digging" the stories. You can see the diggers disappear along with the stories as Digg deletes them.
Other screens just show the data in different ways.