Bluebird Web Sites
The North American Bluebird Society Web site tells you everything you need to know about bluebirds, including plans for building nesting boxes. The Eastern Bluebird page of Cornell University's All About Birds Web site not only provides lots of information, it also has a recording of the bluebird's call, which they describe as a "soft, low-pitched tu-a-wee with a querulous tone." (I love how ornithologists try to translate bird calls into something we can pronounce!)
Clever Gardening Technique
Landscaping for the Birds
In addition to providing nesting boxes, consider adding berry-producing plants to your landscape to provide food for bluebirds and other winter dwellers. Focus on plants that retain their fruits through fall and winter. Good choices include dogwood, elderberry, eastern red cedar, holly, serviceberry, bayberry, and rose varieties that produce abundant hips.