I could have sworn that powers with ongoing-effect keywords Stance and Rage ended when the user became unconscious. But the keywords as defined on PHB2 page 220 say only that they end at the end of the encounter or when you enter another stance/rage.
Now, presumably if you're unconscious you don't still, e.g. deal Rain of Steel damage to adjacent enemies. But once the Leader gets you back up, I guess you just carry on Raining?
EDIT: A quick glance at the wording on Rain of Steel confirms my intuition about the time during which you're unconscious--you can't make opportunity attacks then. But beyond that..?
Now, presumably if you're unconscious you don't still, e.g. deal Rain of Steel damage to adjacent enemies. But once the Leader gets you back up, I guess you just carry on Raining?
EDIT: A quick glance at the wording on Rain of Steel confirms my intuition about the time during which you're unconscious--you can't make opportunity attacks then. But beyond that..?