It's the end of an era, the death of Arthur C Clarke. He was one of two authors who introduced me to science fiction (the other being Ursula K Le Guin).
My favourite one of his books has to be The Fountains of Paradise, but I also found Childhood's End deliciously creepy. One of his short stories, The Nine Billion Names of God, is one of my favourite short stories (even though Buddhists don't believe in "God" in quite the way that the story implies).
He also invented the space elevator and the idea that geostationary satellites would be ideal telecommunications relays.
Quite a few people have remembered him on their blogs:
Here is to Arthur C. Clarke. Here is to Sri Lanka. by Iva Skoch
Gadling - http://www.gadling.com
Arthur C. Clarke: An Appreciation of a Life Well-Lived by Jeff VanderMeer OMNIVORACIOUS - http://www.omnivoracious.com/
Arthur C. Clarke, 1917 - 2008 by The Bad Astronomer
Bad Astronomy Blog - http://www.badastronomy.com/bablog
Arthur C. Clarke Appreciation by Jeff VanderMeer
Ecstatic Days - http://www.jeffvandermeer.com
An appreciation of Arthur C. Clarke
Official Google Blog - http://googleblog.blogspot.com/
Arthur C. Clarke, RIP
skepticalobservor - http://skepticalobservor.blogspot.com/
Remembering Arthur C. Clarke by Dave Itzkoff
Paper Cuts - http://papercuts.blogs.nytimes.com
Arthur C. Clarke: 1917 - 2008 by Dan Sandler
Control Freak - Video Games - http://blogs.orlandosentinel.com/entertainment_videogames/
Arthur C. Clarke RIP by Stuart Woods
Quillblog - http://www.quillandquire.com/blog
RIP Sir Arthur - Liz Williams
Arthur C Clarke is dead by Al Billings at In Pursuit of Mysteries