Xbox Live's Stephen Toulouse has mentioned that anyone caught exploiting Modern Warfare 2's Javelin glitch in multiplayer will get suspended from Live.
"While IW works on getting the MW2 glitch fixed, people we catch using it will receive suspensions from Live. Play fair everyone," he told the Twittersphere (thanks Kotaku).
"For those asking, cheating suspensions are usually 24 hours for first offence," he added later. "But egregious cheating can be 2 weeks!... Using any bug or glitch to gain advantage in a game is expressly against our Terms of Use and Code of Conduct."
The Javelin glitch involves equipping a rocket launcher a certain way and sprinting, which effectively turns the user into a suicide bomber. As soon as you're killed, you'll explode, taking out everyone in the vicinity. It works on the PS3 and 360 too.