The adminblock module enables admins to display a block with the comments approval queue and the node moderation queue. Each item gets their own edit link and delete link for quick administration.
It's a very simple module but convenient for small websites that moderate comments and/or content and want easy access to the administration links.
The block will only show for users with "administer nodes" privileges. If there are no comments to approve and no nodes to moderate the block will not show.