A DigitalPoint Forums thread has an image of Google adding Favorite Icons (favicons) in the site list. I personally do not see them, but here is a picture from the thread:
I am pretty sure this is new, because the favicons are not showing up in my Webmaster Tools console.
What does this do for you? Not much - but it does help you differentiate the sites in the list a bit faster.
Forum discussion at DigitalPoint Forums.