Our frequent commentors should have noticed a new way of commenting. Before, when you clicked on the comment link, a new tab or window would open up, making it difficult to see the post that you wanted to comment on.
Now when you click on the comment link you're taken to an inline comment form at the bottom of the post. This should make commenting a lot more convenient since you won't have to switch back and forth between tabs or windows. Just scroll up a little to see the post!
It's still an experimental feature of Blogger in Draft and has some issues in some browsers. Let us know if you run into any problems and I'll take a look at it (or tell Blogger to).