Some interesting links:

How Stuff Works: http://www.howstuffworks.com
This site provides a veritable goldmine of summary educational information on just about every subject under the sun!

Computing Assistance: http://www.computerhope.com/qanda.htm
A good source of information for keeping your PC safe.

Radio Society of Great Britain: http://www.rsgb.org/
All relevant Amateur Radio information for people in the UK.

NASA - Visible Earth: http://visibleearth.nasa.gov/
An amazing collection of high-resolution images from Space.

EUCLID - European Cooperation for Lightning Detection.
http://www.euclid.org/realtime.html
Want to see where the lightning is RIGHT NOW across Europe?

GEO - Group for Earth Observation: http://www.geo-web.org.uk
The foremost amateur group involved with every aspect of receiving weather satellite imagery from Space.

Global Warming - The True Facts:
http://www.canadafreepress.com/2007/global-warming020507.htm
Never mind what the politicians say, there's a scientific truth that has been kept away from public scruitiny for political and economic reasons..