I'm a writer who finds most of his subject matter in scientific knowledge, technological change and their effects on our world and our minds. I'm blogging about Mars because, having written a book about the subject -- "Mapping Mars: Science, Imagination and the Birth of a World", since you ask -- I still haven't got the great desert in the sky out of my system.
That said, for the past seven years or so blogging at Mainly Martian has been remarkably sparse (there's been a recent uptick thanks to MSL). I blog somewhat more regularly at Heliophage and work considerably more regularly at The Economist. I tweet as @EaterOfSun