Here is just one site that I saw address this, entitled
"Flag To Fly At Half-Staff This Fourth Of July"...
http://www.theomahachannel.com/4july/3478583/detail.html
Also mentions the bow or streamer thing.
In your link:__________________________________________________________Bush's order applies to all federal buildings, grounds, and naval vessels of the United States. It is up to the governors of each state to determine the length state government buildings will fly the flag at half-staff.
Local governments, school districts and businesses are also free to determine their own protocol.
I like the idea about the black streamer. We have a flag that projects from the house, and we pulled the flag down some, but couldn't really take it halfway. I'll get some black ribbon this weekend and do that.