This page contains my selection of great scientific and skeptic links. More will be added as I come across them on the internet.

Bad Astronomy
Phil Plait, the creator of Bad Astronomy, is an astronomer, lecturer, and author. He is a skeptic, and fights misuses of science as well as praising the wonder of real science.

Use this search engine instead of Google. Better results (ad-only sites or sites which only contains information scraped from the net are blocked), simpler results, zero-click information about what you search for (this is amazing) and more. And none of Googles privacy issues.
Use it!

What's The Harm?
This site is designed to make a point about the danger of not thinking critically. Namely that you can easily be injured or killed by neglecting this important skill.

You want to look up some facts? Have something converted or calculated? Look up and compare statistics of something? Look no further. Wolfram|Alpha is the place to go.

Sixty symbols
Ever been confused by all the letters and squiggles used by scientists?
Hopefully this site will unravel some of those mysteries.
Sixty Symbols is a collection of videos about physics and astronomy presented by experts from The University of Nottingham.

Galaxy Zoo
Interested in doing some real astronomy but can't afford a huge telescope in the mountains? Then visit Galaxy Zoo and take part in the classification of millions of galaxies and do your part to further our understanding of the universe.

James Randi Educational Foundation
As I mentioned here the JREF is an educational resource on the paranormal, pseudoscientific and the supernatural worth another permanent mention here.

The Skeptics Dictionary
The Skeptic's Dictionary features definitions, arguments, and essays on topics ranging from acupuncture to zombies, and provides detailed information on things supernatural, paranormal, and pseudoscientific.
Dozens of topics in logic, perception, science, and philosophy are also covered to help explain the appeal and popularity of occult beliefs and to provide a guide for critical thinking