The issue I've yet to see advocates of keeping Terri Schiavo on her feeding tube address is this: Terri reportedly said, before she was in a coma, that she did not want to be kept in a permanent vegetative state.
I've heard many people talk as though Michael Schiavo is doing everything he can in an insane bid to kill her. What if he is telling the truth? Maybe he isn't trying to snuff her, to have her executed, or to whatever other phrase you want to use. Maybe he is really trying to respect her wishes? True, that might not match what someone else would have wanted her to decide, but it doesn't mean they aren't her wishes.
Focusing on the issue at hand: Is a life spent in a permanent vegetative state still worth living? Does her life still retain the intrinsic value of all human life?