V9: Events are everything.
V11: Not exactly important, but physics made the game a whole lot nicer if you go around blowing things up
V14: Allowed every single noob in the community to make a server, but I could too, so I liked this
V15: Speeeeeeeed
V21 does not feature on my list because I can't run the shaders, and until I can all the update has done has removed terrains, made adjustable plate a default map and provided a game menu which is pretty awful if you want to enable a lot of addons.
