modr8 provides an administrative interface for managing content in moderation.
Allows you to preview content, as well as approve or deny, and send messages to the author informing them of your choice.
This module adds back that capability and also prevents posts that are
in moderation from showing up in lists, on the /node page, etc.,
unless the user is the node's author or unless the user has the
"administer nodes" or "moderate content" permission. This is NOT an
access control module, however, so posts that are in moderation can
still be viewed if a user knows the path (URL) corresponding to that
post.
or
Moderation
It allows moderators to review all posted content while already
published. Included Ajax based functionality allows the moderators to
preview the content and to change status like published, moderated,
promoted, sticky without having to leave the page. A separate page
provides a log, listing all status changes with who and when it was
changed.
and also take a look at this Maestro module