The world wide web is a vast resource of useful information...here are some other cool astronomy related sites.
http://www.thestarvoyager.com
Little known, but they kindly added me into their directory so this is the reciprocal back link
http://www.itp.uzh.ch/~corbett/astroviz/astroviz.html
http://cosmicrays.wordpress.com/
AstroViz is a parallel visualization tool for astrophysical simulations implemented as a plugin extending the open source application ParaView developed by Christine Corbett Moran, Department of Theoretical Physics, University of Zurich. Looks like a good piece of software if you are into simulating the universe.
http://365daysofastronomy.org/
The 365 Days of Astronomy Podcast is a project is publishing one podcast per day, 5 to 10 minutes in duration, for all 365 days of 2009 and now into 2010. The podcast will be made available through an RSS feed. The podcast episodes will be written, recorded and produced by people in astronomy from around the world.
http://www.universetoday.com/
A great blog site that contains the frequent postings on astronomy news and discovery. It is also home to the excellent Astronomy Cast.
http://www.sixtysymbols.com/
Sixty Symbols is a collection of videos about physics and astronomy presented by experts from The University of Nottingham. They aren't lessons or lectures - the films are just fun chats with men and women who love their subject and know a lot about it!
http://michaelnielsen.org/blog/
Michael is writing a book about The Future of Science. The book describes a major shift now occurring in how scientific discoveries are made, a shift driven by online tools for collaboration and sharing of scientific information. The book describes both the great potential such tools have to improve how science is done, and the challenges that must be overcome to fully realize that potential.
http://www.galaxyzoo.org/
Galaxy Zoo is an online astronomy project which invites members of the public to assist in classifying over a million galaxies. It is an example of citizen science as it enlists the help of members of the public to help in scientific research.
http://amandabauer.blogspot.com/
Thoughts, musing, pictures and jokes on astronomy.
http://www.astrobetter.com/astronomy/
This blog is intended for mac-using professional astronomers. The goal of Astro Better is to provide information and tips about streamlining all the ways we use our Macs everyday. Not only will we talk about X apps, but we’ve expanded the discussion to include email, web browsing, paper organization, iPhone apps, and the like.
http://www.starstryder.com/
The blog site of Pamela Gay - one of the presenters on Astronomy Cast.