Big on the Internet: SF writers who blog by Carol Pinchefsky - Intergalactic Medicine Show
http://www.intergalacticmedicineshow.com/cgi-bin/mag.cgi?article=006&do=columns&vol=carol_pinchefsky
"For the science fiction writer, the reasons to blog are perhaps a little more humble but no less important to those who do: it's a simple yet successful tool for writers to promote their work."