History reviewer is a script, written in JavaScript, that changes "history" tab style on Wikipedia, in order to bring attention to it if article was changed recently. While it is a standalone script, it works best as an extension to the Navigation popups gadget.
Features
time duration since last edit is compared to the average duration between edits (5 most recent edits)
if recent edits are too close to each other (less than 30 minutes), it marks the history to be an editWar
if last edit was made more recently than previous edits were apart (and before a week ago), it marks the history to be recentlyChanged
if the last edit was made by an unregistered user or by user with few contributions (less than 5), it marks the history to be made by an questionableEditor
if only 1 edit was ever made, it marks the history to be of a new article
otherwise, it marks the history to be ok
the actual history is shown on mouseOver event of the "history" tab (thanks to the Navigation popups)