Sci-Fi-O-Rama
Sci-Fi-O-Rama is one of the more striking collections of links to online artwork that we've seen. It's a capitvating range of retro posters and illustrations, ranging from classic Omni magazine covers to the work of John Berkey.
Voyager Online / Voyager Blog
Over at Voyager Online, there is a a huge community of Australian-based fantasy readers and lovers who are incredibly active.
Skiffy
Another gem is the Skiffy blog, an excellent place to get turned onto classic sci-fi novels from the likes of Arthur C Clarke, and see conceptual art, behind the scenes photos and other nostalgia relating to movies like Blade Runner.
io9
The mega-blog for all things sci-fi is io9, which manages to almost do the impossible by catering to everyone from fans of shows like the original Star Trek to JJ Abrams Lost. good for pics, movie updates, and extensive coverage of events like Comic-Con.
Tomorrow's Thoughts Today
Tomorrow's Thoughts Today is an intruiging site. Articles are organised into 3 categories - Fast Thoughts, Medium Thoughts, and Slow Thoughts. You can browse each, or, filter the entire list by choosing topics such as science fiction, urbanism, utopia, cities, nature or technology. The appeal is the offbeat gems it uncovers, from stories written in Google Maps (see picture above), to details about the site's "The Thrilling Wonder Stories architecture and science fiction symposium".