I am glad he had a chance to participate, from his home in Sri Lanka, in the Cassini encounter with Iapetus, the moon of Saturn where astronaut David Bowman encountered the first monolith in Clarke's novel 2001: A Space Odyssey. He sent to JPL a video greeting, which you may enjoy watching again: here is the video, and here is the transcript.
Clarke lived a full life. It is amazing to consider the development of technology and discovery that he witnessed -- and participated in, and stimulated, and foresaw -- throughout his lifetime. But consider this: his life played out primarily in the twentieth century. We are now at the dawn of the twenty-first. What discoveries will this century see, and who will be its visionaries? Who will shoulder Clarke's legacy?