For lack of a better name...
This is something we'll add in (and organize better) after 0.72 goes out the door. It is a list of comments shown below the list of posts on the Post/Edit page.
This is handy for accessing recent comments you might need to edit/delete. For example, if you've been hit by a comment spammer.
Grab it from my WordPress Hacks page. Installation instructions are in the README.txt.
NOTE, this will only work with recent WordPress code - it may even require something later then the current beta release. I have not tested it on anything but the latest CVS files.