Cornell's Project Feeder Watch is starting up again.
Project FeederWatch is a winter-long survey of birds that visit feeders at backyards, nature centers, community areas, and other locales in North America. FeederWatchers periodically count the highest numbers of each species they see at their feeders from November through early April. FeederWatch helps scientists track broadscale movements of winter bird populations and long-term trends in bird distribution and abundance.This winter, the project runs from November 11 (this Saturday) through April 6, 2007. Participants may join at any time of year and set their own level of commitment.
For more information, see the link above; to sign up, go here.