Steve, I have a new respect for bluebirds. I never really paid much attention to them in the past. Saw them in the pines in my yard, so I decided to build the nest boxes with the scrap cedar. I never realized that they hunt somewhat like a hawk or owl. As I mentioned above, they scope things out from their perch and pounce on a bug or worm, then right back up to their perch. They do seem to eat a great deal of bugs and I thank them for that. They're also nice to photograph. Have to admit though, I don't care much for their song.
I need to produce some hummingbird habitat. I'll look into that trumpet vine you mentioned.