A free planetarium software
Zip File containing the Carleton University Landscape files for Stellarium

Ottawa Clear Sky Chart
Forecast of atmospheric conditions for the next 48 hours

Space Weather
Current space related conditions

Universe Today
Various space news

The Weather Network
Map of the cloud cover forecast for the next 6 hours

Impact Earth
Simulation of the effect of an asteroid impact on Earth

How to Avoid The Agony When Buying Your First Telescope
A good article about purchasing a telescope

American Association of Variable Star Observers
Be involved in the measurement of the variability of stars

The Hertzsprung-Russell Diagram Explorer
An online tool to simulate stars according to their HR diagram location