Can be hard to keep track of assignments handed in late, as there is no one place in moodle which shows a list of assignments that have been submitted but not yet matked (e.g. in grades) It would be a nice feature....
In the meantime,if you have access to phpmyadmin/moodle's version or any other sql client, attached is a query which produces a simple lsit (for all your courses) of assignments uploaded (numfiles=1) but not marked (timemarked=0, the default value)
Hope you find it useful
Andy D