I know at least one person who has been flying the flag at half-staff for years. He is in mourning for his country.
Others, like me, decline to fly Old Glory at all, not as long as that JEF can sully her reputation at home and abroad. The Gadsden comes out on certain special days— the last was 9/11/12— and flies from the top or the pole.
It may be that flying the flag upside down is a valid form of distress, but as distressed as I see our country, I haven't been able to bring myself to either fully approve or disapprove of this method.
I also see your point, and I think of it every time I drive up to my house and see my flag. Funny. I used to have an American Flag tie that I wore to work for years on days that seemed to ask for it, including election day. Since Obama was elected, I have been unable to wear it. It pains me that I have even begun to consider the appropriateness of flying MY flag, as you have done.
Again, I admit to being conflicted by it.
Alan Keyes used to wear a flag pin on his lapel upside-down for the same reason...not sure if he still does...