1. http://www.jodrellbank.manchester.ac.uk/astronomy/nightsky/ This is a great site which offers monthly updates of planets, meteor showers, comets and other celestial events.
2. http://www.scopereviews.com/ This is a great resource for those who want to buy a telescope. The reviews by Ed Ting are detailed and sincere. You can find reviews of almost all types of telescopes.
3. http://www.telescope.com/content.jsp?pageName=Monthly-Star-Chart you can download a magnificent star chart here. It is in pdf format. They update the chart every month. Right click on the star chart link and then click ‘save link as’ to download.
4. http://www.youtube.com/watch?v=EHoFvSKMlec It’s a pleasure to watch these youtube videos! They are very informative too. It’s like sitting in your backyard and observing the starry sky. All who likes astronomy must watch these videos.
5. http://www.astro.wisc.edu/~dolan/constellations/ a complete catalogue of constellations, messier objects, and other astronomical objects.