Some URLs that I find interesting:

http://www.uslst.org/lst325.htm ST-325 Ship Memorial

http://www.pipedreams.org For enthusiasts of pipe organs

http://www.airmail2000.com/ Airmail2000 – A wireless e-mail solution

http://www.nipc.gov National Infrastructure Protection Center

http://www.qsl.net/w8wn/hscw/hscwopen.html K1JT's FSK441 and JT44 DSP software for weak signal meteor scatter and Earth-moon-Earth communications.