Originally Posted by NeutralNovice
I haven't had a chance yet to use the data meter built into our stock ICS build so I don't know if that one has the auto-disable feature. I also don't remember seeing a widget for it as well.
According to what the pop-up window said, it should disable data the moment you reach the threshold you set. You also have a warning threshold you can set. You can also restrict background app data to wifi only. But it doesn't allow a choice of apps, so I am assuming it will restrict all apps.
Edit: just adding that there is no stock widget for monitoring data.