I checked out the current Trunk of WordPress 2.7. At first glance I noticed some cool features in the comment management.
In discussion settings you can adjust, after how many days a comment function should be disabled, also the reply depth of a comment is possible to define. Another additional feature is to set how many comments are displayed on each page. Here are some screenshots:
Even if the development isn't finished yet, WordPress 2.7 has some new interesting features, which were only available with the help of several Plugins.