I have just been browsing around Digg and noticed that something was a little bit different. It seems that they have updated the comment system on stories into a better format.
I personally think it looks a lot better, its more clear and consice and it also allows you to filter comments to show just yours, or just your friends.
It also seems to make replying and viewing individual comments a lot easier.
All in all a great improvement :o)
Just i was writing this, the Digg blog post explain all the changes hit the front page.