Info sheet of where to start looking for Ham related information.

My web site (W1NRA), Columbus club pages, more ham related info.
http://www.geocities.com/w1nra/home.html

Take practice exams on line here:
http://www.gogas.org/hamexam.php

Ham radio on line:
http://www.hamradio-online.com/

ARRL American Radio Relay League: index
http://www.arrl.org/htdig/bigindex.html

How ham radio works:
http://www.howstuffworks.com/ham-radio.htm

US Amateur Bands: (where you can operate)
http://www.arrl.org/field/regulations/bands.html

QRZ.com where you can look up any ham licensed in the us and most of the world hams.
Has a lot of other info as well. mods for radios, software, etc.
http://qrz.com/

Amateur Radio Trader magazine, probably more useful links than any other site on the net.
http://amradiotrader.com/

Space information, shuttle, mir, international space station etc.
http://spaceflight.nasa.gov/index-m.html