Free online classified ads and job posting at Astanda.com
http://www.arrl.org/hamfests.html
Search listings of all known ham conventions, swap meets and hamfests.
http://www.aprs.net/
Java Applet for Automatic Position Reporting System.
http://morsecode.scphillips.com
Includes Java and CGI translators, alphabets, and FAQs.
http://www.arrl.org/qex/
The purpose of QEX is to: 1) provide a medium for the exchange of ideas and information among Amateur Radio experimenters 2) document advanced technical work in the Amateur Radio field, and 3) support efforts to advance the state of the Amateur Radio art.
http://qrz.com
Includes news, searchable callsign database, license renewals and updates, DX spotting reports, APRS resources, clubs, solar report, and links.
http://www.qsl.net/
Dedicated email and webspace service for the Amateur Radio Community; free space to licensed Amateur Radio Operators worldwide.
http://www.qth.net
A listing and search of amateur radio email lists hosted by QTH.Net.
http://www.qth.net/
A listing and search of amateur radio and DXer email lists, including AM/FM/TV, SWL, and scanning.
http://www.rac.ca/
Canadian HQ features rules and regulations, club information, contest schedules and links.
http://www.rsgb.org/
Resource of amateur radio and technical information, plus a bookshop and links.
http://www.reactintl.org/
World headquarters of REACT International.
http://spaceflight.nasa.gov/realdata/index.html
NASA information on the International Space Stations whereabouts, Keplerian elements for the ISS and Shuttle, and sighting prediction information.
http://www.dxlc.com/solar/
A daily, updated report on solar activity. Useful for DX operators.
http://www.tapr.org/
Technical innovations in the field of packet radio digital communications plus projects, APRS and GPS news, and special interest group listings.
http://www.ipass.net/teara/info.html
TEARAs Technical Info and Magazine SourceListing of amateur radio related ezines, newsgroups, and mailing lists.