The Literature StackExchange site is now available to the public. If you’ve got questions that need answering by a literature expert, then this is a good place to ask – note that their current definition of “literature” is quite wide (it includes popular fiction, not just “those considered of superior or lasting artistic merit”).
The site actually has quite a large proportion of questions that are about science fiction and fantasy literature, so if you’ve got some expertise there, you might be interested in answering some questions for them (if you’ve got an account on our site with at least 200 reputation, then if you associate the two accounts – you’ll be prompted to do this if you use the same OpenID – then you’ll start off there with 101 reputation).
If you’ve got a question about science fiction or fantasy literature, where do you ask that question, now that there’s both sites? Consider who you would like an answer from: an expert in science fiction / fantasy, or an expert in literature in general; different types of questions will suit each site. Some questions will be perfectly acceptable on both sites, and in those cases it’s up to the asker to decide where they’d like to ask (in general questions won’t be migrated between the sites, and duplicates may exist on both sites, as long as they are not exact duplicates). You should definitely not post the same question on both sites, however.
If you’ve got questions about writing science fiction or fantasy, then you’re still probably best off asking over at Writers rather than Literature or our site. Note that the Literature site currently accepts recommendation questions, which are off-topic at our site, so if you’re after a science fiction or fantasy recommendation, then you can ask there (we continue to welcome these questions in chat, as well).