For new telescope owners (or those contemplating a purchase) I've always recommended ""Turn Left at Orion"" and "Nightwatch" Neither is overly technical or expensive, but enough to allow you to identify the constellations/asterisms and major objects of the night sky. Both were required reading for my kids when they got their first telescope (after their binoculars). You can both from Amazon for $40.

Another recomendation would be Cartes du Ciel software, a planetarium program you can download and install on your PC, with as much or as little information as you desire - and it's free.