On two seperate occasions now, I have see the player "Schmitd" attacking and sinking ships on his own team.  He's the only person I've seen do this so far, so thankfully it's not a rampant problem.  BUT, there MUST be severe penalties for players like this, as the behavior detracts greatly from gameplay.

If this problem is not addressed when the game launches, we'll be forced to keep a list of players' names that team kill so that they can be targetted very early in the game and removed from play.