Jonathan's Space Report
The JSR describes all space launches, including piloted missions and automated satellites. Updated about once a week; available by email or at Web site.
http://hea-www.harvard.edu/QEDT/jcm/space/jsr/jsr.html

International Space Station Visibility
NASA's visibility forecasts and orbital data for the ISS.
http://www.hq.nasa.gov/osf/station/viewing/issvis.html

Heavens Above Satellite Predictions
What satellites can I see tonight? Point your browser here and find out when ISS, Mir, and all the rest are coming your way. Iridium flares, too. No tracking software required, just enter your location and get a custom tracking page that you can bookmark and refer to any time.
http://www.heavens-above.com/

Visual Satellite Observation in Maryland
Information on bright, easily observed satellite passes for the Maryland/DC area. Sections on NASA TV Webcasts and the International Space Station.
http://hometown.aol.com/mir16609/

Orbitessera
Download Keplerian elements and satellite tracking data. Provides orbital and frequency information for the Space Shuttle, ISS, Mir, weather satellites, and amateur radio satellites.
http://www.orbitessera.com

Mike McCants' Satellite Tracking Web Pages
Visual satellite tracking two-line elements and software, with predictions for the Austin, TX area.
http://users2.ev1.net/~mmccants/

ON1DHT's Satellites and Radioamateurs in Space
Guide to observing satellites. Also includes information on satellite communication.
http://users.skynet.be/on1dht/sat-info.htm

Visual Satellite Observer
A detailed, interesting, useful collection of information for anyone who wants to view satellites in orbit.
http://www.satellite.eu.org/satintro.html

Iridium Flares
The new Iridium satellites are good for more than just telephones. They flash brighter than Venus for just a few seconds when the Sun reflects off their antenna panels.
http://www.assa.org.au/observing/iridium/

Tiger Maps
You can track most satellites without your exact latitude and longitude: At Heavens Above you can just enter your city or town and get good results. But if you want to observe Iridium flares, you need to pinpoint your location. U.S. observers can use the Tiger map service to find their exact latitude and longitude.
http://www.census.gov/geo/www/maps/

SoCal Sky Lights
Guide to observating rocket launches, satellite and space shuttle overflights, and meteor showers for Southern California.
http://www.schnapp.org/skylights.html

Astrospider
Collection of video footage of the International Space Station taken with an amateur computer controlled telescope. Also includes Astrophotography and Remote imaging sections.
http://www.astrospider.com/

Falcon's Nest Space Page
Personal notes from a satellite tracking enthusiast.
http://home.earthlink.net/~w0dfi/2nd.html