The Eastern Bluebird is always a sight for sore eyes, and apparently their numbers are recovering from a decline. Their recovery is in part because of human assistance with Bluebird houses.
Right now is a good time to put up new nest boxes, and to clean out the old ones.
You won't see Bluebirds often in suburbia because they are partial to good-sized fields and edges. At the farm, we have about 17 Bluebird houses up on snake-proof poles. Half the houses are usually taken over by Tree Swallows, some are filled with sticks by House Wrens, and our cheerful Bluebirds use the rest of them.
In New England, Bluebirds are semi-migratory, and can sometimes be seen in winter flocks, foraging widely for fruits and berries.
The CLO entry of the Eastern Bluebird here.