Fatbirder.com is a great site for complete worldwide information on birds. The above link takes you directly to the NC page, part of the North America section. BE SURE TO SCROLL DOWN, as the page is long, and a lot of information is below the introduction.
Bird Calls from USGS - This page links to bird songs and calls in .wav format you can listen to in order to help identify your birds.
BirdForum.net
- a great place to meet birders, get birding help and information, look up
species and much more.