Have any of you guys seen Command & Conquer 3's replay system? It is fantastic!
-Patches have no effect on replay viewing
-You can watch the replay from your own view, any player's view, or even a commentators view.
-The commentator can draw on the screen like sports casters.
Say what you want about C&C 3 as a game, but I have yet to see a better implementation of a replay system in any video game, ever.
Some good stuff indeed.