graphical avatars for blog visitors/readers

I am looking to add to a site sidebar the small graphical icons for all of the visitors. I have seen this on a few sites and thought that this was the mybloglog widget.

The code I get from the mybloglog widget gets me a large scrolling box with options for popouts. I am looking for just a bank of rows of images for each of the site readers.

Anyone have the info on this?