The Business
NaT Graphics

Some interesting links:

How Stuff Works:
This site provides a veritable goldmine of summary educational information on just about every subject under the sun!

Computing Assistance:
A good source of information for keeping your PC safe.

Radio Society of Great Britain:
All relevant Amateur Radio information for people in the UK.

NASA - Visible Earth:
An amazing collection of high-resolution images from Space.

EUCLID - European Cooperation for Lightning Detection.
Want to see where the lightning is RIGHT NOW across Europe?

GEO - Group for Earth Observation:
The foremost amateur group involved with every aspect of receiving weather satellite imagery from Space.

Global Warming - The True Facts:
Never mind what the politicians say, there's a scientific truth that has been kept away from public scruitiny for political and economic reasons..