The following are examples of what I consider to be good or interesting science blogging. Other opinions may vary.
Ed Yong’s Not Exactly Rocket Science (at National Geographic). Ed has been so successful that his blog is now closed. He is now as staff writer at the US magazine The Atlantic. And he has found the time to publish his first book, I Contain Multitudes, which I’ve reviewed.
Dorothy Bishop (Prof. of Psychology at Oxford) writes her BishopBlog on Blogger.
In the Dark, by Peter Coles: astronomy, science, jazz and other matters.
Jon Butterworth’s Life and Physics at the Guardian.
The Urban Scientist aka DN Lee (at Scientific American).
My friends at Occam’s Typewriter – have a browse; lots of different styles there.
Letters of Note is not strictly a science blog, but it is fascinating.