There is so much out there! Here is a starter list of the must-see sites:
Cornell University has an excellent web site for the study of birds. The best part of this site is that Cornell offers the general public an opportunity to participate in actual ornithological studies. Research kits, reference guides and data forms are sent to willing participants of the program. When data is collected, it is sent back to the lab for analysis, study and even eventual publication. the following is a synopsis of this site's contents:
Conservation News
Laboratory Studies
Public Projects: for those who want to get involved in scientific studies
Library of Sound: for the collection and study of animal sounds
Publications listings
Membership
For the Bird-Watching Enthusiast
An excellent site for obtaining bird-watching information that is very comprehensive http://www.birder.com
This site includes the following and more:
Checklists: (includes Canadian sites such as Point Pelee National Park)
Rare Bird Alert
Hot Spots for Birds
Geographical Birding Guide
Favourite Birds
Software, magazines, books, prints etc., about birds
Two more additional important bird-watching sites are the National Audubon Society's web site and a site dedicated not only to the study of wild birds but also to the memory of the late great ornithologist Roger Tory Peterson:
http://www.petersononline.com/