This weeks quiz bird was a juvenille Gray Jay. It is a dark gray bird with white on the malar. Structurally identical to the adult but without dark slaty gray overall.
Northern Mockingbird was another answer suggested by a few people - Northern Mockingbird juvenilles are almost the same as the adult but have some light spots on the breast for a brief period of time. The bill shape is also very different between Gray Jay and Northern Mockingbird.
This bird was seen in Pittsburg, NH on June 23rd, 2009.