Organizations ranging from government agencies such as the U.S. Fish and Wildlife Service to non- profit conservation groups offer Internet sites on peregrine falcons and other birds of prey. A number of sites appear to be the personal creation of individuals with a passion for falcons.
A good place to start is http://www.afternet.com/~teal/falcon.html, which itself contains only brief information about peregrine falcons, but has a long list of links to other sites. Another lengthy list can be found on Airyn's Raptor site, http://www-personal.umich.edu/~airyn/zoo/raptors.html. Airyn's also allows you to click for images and sound bites of falcons and several other raptors. But be aware that you'll need software that can accomodate audio.
Likewise, a vocalization of a peregrine falcon is available through http://www.vetmed.auburn.edu/raptor/nat_hist/peregrin.htm. This site also includes a Cliff Notes-type report on peregrine falcons. It is put out by the Southeastern Raptor Rehabilitation Center, in Auburn, Alabama.
In October, Peregrine Fund president Pete Jenny traveled to South Texas to band peregrine falcons. His diary of the trip is included in http://www.peregrinefund.org/texas.html. The Boise, Idaho-based Peregrine Fund has its own home page, at http://www.peregrinefund.org/
The background (in governmentese) on listing the arctic peregrine falcon as endangered, its
recovery, and the rationale for its delisting in Alaska is outlined in a report produced by the U.S.
Fish and Wildlife Service:
Finally, Argos, the satellite system that recieves and transmits telemetry information for the peregrine tracking project has a site with links to its many projects: http://www.argosinc.com/.