This plugin will show the draft posts created in all your WPMU blogs. To activate, just download the PHP file and put it in your wp-content/mu-plugins folder. The file can be downloaded here….
To view all posts, click on ‘Site Admin’ and then on the ‘Posts for moderation’ submenu.
To do: make ‘view’ and ‘edit’ links, a bit like the WordPress ‘manage’ interface actually. In any case, it’s probably best if each theme you supply has an ‘Edit this post’ link, so the moderator can first view the post and then edit it if necessary without going back to admin screen.