Elfwood - A strictly Science Fiction and Fantasy themed online gallery and library site. It takes a while (approx. 2 weeks) to update your works there as it has to be approve by moderators before publishing.
My Elfwood Gallery: www.elfwood.com/~mcmillen
DeviantART - An overall online gallery and store that showcases your work of any type, including the option of selling it in prints and/or novelty items.
My DeviantART Gallery: crystalium.deviantart.com