Normal cataclysm dungeons give a justice points reward of I believe 70 justice points, 7 times a week, and after those are done you receive gold and xp. in the level 84-85 dungeons such as grim batol, you also receive 30 justice points per boss killed, doing a normal dungen, lets say Halls of Origination you would receive the 70 justice points reward from random dungeon finder and 30 justice points for each of the 7 bosses.
Heroics on the other hand, you receive 70 valor points 7 times a week for using the random dungeon finder, and 70 justice points for each time after you weekly amount of Valor dungeons has run out.
The 70 you receive then does not lower.
In every heroic cataclysm dungeon, be it, Grim Batol, The Stonecore, Blackrock Caverns, you receive 70 justice points for each boss killed, again lets say you did halls of origination you would receive either 70 Valor points or 70 justice points for completion using the random dungeon finder, and 70 justice points for each of the 7 bosses in the instance.
Heroic Zandalari, for these you receive 140 valor points 4 times a week and 70 Justice points per boss.
Hope that helped, even if it was only a small amount =)
Edited by Zirnitra on 06/06/2011 11:01 BST