Blizzard has sent out a friendly reminder regarding cheating, exploiting, and/or using hacks in StarCraft II.
According to Blizzard, the firm takes "cheating in our games very seriously" and players who engage in such acts will be permanently banned from logging into Battle.net and playing StarCraft II, especially if it comes to light they were using modifications to the game client.
Here's the blurb:
Blizzard Entertainment has always taken cheating in any form in Blizzard games very seriously, and that's no different for StarCraft II. If a StarCraft II player is found to be cheating or using hacks or modifications in any form, then as outlined in our end user license agreement, that player can be permanently banned from the game. This means that the player will be permanently unable to log in to Battle.net to play StarCraft II with his or her account.
Playing StarCraft II legitimately means playing with an unaltered game client. Doing otherwise violates our policies for Battle.net, and it goes against the spirit of fair play that all of our games are based on. We strongly recommend that you avoid using any hacks, cheats, or exploits. Suspensions and bans of players that have used or start using cheats and hacks will begin in the near future.
Consider that a warning, then.