Check out this nicely annotated list of space blogs (including this one) on the find-schools-online.com website.
To this list I would add at least three more important links:
Space Transport News
Clark S. Lindsey provides one-stop shopping for breaking commercial spaceflight news and commentary, updated several times a day.
Futron analyst Jeff Foust pulls together links to space news stories each day from around the Web.
Another site by Foust, this one devoted to his insights on commercial manned spaceflight news.
What else are we missing?