I like that in TF2 you can report bugs and submit screenshots of cheaters using a form available in-game. It would be interesting if reporting a cheater would also send information about the last minute or two of the player's stats, like their Steam ID, how many bullets they missed, KDR, or any kind of evidence that could support the cheating accusation.
It would be nice to see this functionality in NS2, cheaters ruin the game for me, and not being able to immediately do something about it aside from leaving the server or begging for an admin is very lame.