I also feed the birds, I really like to see the Gold Finches at the upsidedown feeder. They're one of the few birds that are comfortable feeding upsidedown and it keeps the other birds from emptying thier feeder.
Notice the upsidedown Gold Finch on the feeder just to the right of center?
I also get a good number of Bluebirds in the yard, they don't eat from the feeders... but I think they feel safety in numbers with the other birds around.
I also get alot of Eastern Meadow Larks too, they don't eat from the feeders either... but feel safer with other birds around. I really like thier bright yellow breasts with the burnt umber bib.