I thought I had solved the problem -- by hanging various colored (but not weather-resistant, at least over a full season) streamers on the outside of my windows. Anything placed on the inside does no good since my back windows are tinted and the reflection is intense anyway.
All four main panes of my back windows have at least one bird strike to their "credit" again now, as does my back (kitchen/backyard) door -- go figure, since at least that one has blinds that should make it clear to birds there's an immovable barrier between them and where they want to go.
I saw some of those 3M stick-ons at the garden center but haven't found a supplier online and I'd need a bunch of them, since they're supposed to be something like no more than 2 feet apart and covering the problem windows. They're see-through so they don't ruin the view from the inside to the outdoors.
Still hunting, in other words. I don't want to hang streamers again this year -- they were annoying and in the right light they actually made my back windows look like they were cracked (as my brother dutifully remarked when he first saw them, "Oh my, you SAID you had a bird problem, but you didn't tell me they'd broken through the glass!")
