It might be nice (and relatively low impact?) to add the date of the inital post in the table cell with the topic starter's ID. It would give you quick visibility as to how old the overall topic is.
Charles Reace (charlesDOTreaceATverizonDOTnet) "Forward!" he cried from the rear, and the front ranks died.
The generals sat, and the lines on the map moved from side to side.
(Roger Waters, "Us and Them")