Ohms law and power law calculator.
http://www.angelfire.com/pa/baconbacon/page2.html
http://www.hobbytron.net/8893.html
Webcam, ccd, and photographs, equipment information, astronomy tools, and tips.
http://www.ngc7000.org/
Belgian amateur presents a resource of HAM radio information, exams, software and links.
http://users.belgacom.net/hamradio/
http://www.geofex.com/circuits/+9_to_33.htm
Here's a clever design idea lifted from the pages of Electronic Design. Stephen Woodward has designed a circuit that allows one pot to adjust two channels.
http://www.web-ee.com/Schematics/DualChannelPot/DualChannelPot.htm
http://www.somerset.net/arm/fm_only_one_transistor_radio.html
Increase the RF output power of your wireless network card to 1 Watt.
http://www.qsl.net/n9zia/wireless/appendixB.html
http://www.hifi-remote.com/wasser/index.shtml
http://www.discovercircuits.com/PDF-FILES/4013cir.pdf