Moodle's Workshop, a vehicle for peer assessment, has been radically overhauled for Moodle 2.0 In my experience it's a module people either use frequently and rate highly or stay well away from because of its complexity. Its reincarnation is both simpler to manipulate and also more powerful so if you haven't used it before, now is a great time to try it out and if you are a dedicated fan, you will be delighted with the improvements.
The best way to highlight the changes is to go off and see a workshop in action. Andy's making one where the students compose a poem which will then be assessed by the others in their class. As it is set up, if you have used Workshop before, you will notice a much neater, less confusing interface.