Here are some links that we think you will find interest in:

National Audubon Society: http://www.audubon.org
Audubon Pennsylvania: http://pa.audubon.org
Audubon at Home: http://www.audubon.org/bird/at_home/#
2nd PA Breeding Bird Atlas: http://www.carnegiemnh.org/atlas/home.htm
Hog Island Maine Audubon Camp: http://www.maineaudubon.org/explore/camp/hi_overview.shtml
Central Pennsylvania Conservancy:  www.centralpaconservancy.org/
The Manada Conservancy: www.manada.org
The Nature Conservancy: www.nature.org
NJ Audubon World Series of Birding: http://www.njaudubon.org/WSB
Operation Migration: http://www.operationmigration.org
Together Green: http://www.togethergreen.org/
Meadowood Native Plant Nursery: www.meadowoodnursery.org
Scott Weidensaul - Interview on "Bird Banding":
http://www.nature.org/wherewework/northamerica/states/pennsylvania/people/art25266.html