General links.

Speculative Fiction General

Speculations

"Speculations is an online resource for writers who wish to break into or increase their presence within the science fiction, fantasy, horror, or "other" speculative fiction genres. We publish a bimonthly magazine, a monthly market list, a Web site crammed full of resources, and host The Rumor Mill, our online community."

Speculative

A site run by zerogravity and big_blank_space of sfandf_writers with stories, features for writers, and a forum.

Pitfalls of Writing Science Fiction & Fantasy, General Useful Information, & Other Opinionated Comments by Vonda N. McIntyre

Twelve pitfalls of writing SF&F.

Fantasy General

Limyaael: The Fantasy Rants

limyaael has made almost 300 rants about the fantasy genre, many of them very thought provoking. Definitely a good read for those looking to break from the ordinary and unrealistic. There are also a couple entries under Limyaael's Rules.

Science Fiction General

Themes/Genres in Science Fiction: An idiosyncratic and woefully incomplete list by Kay Fowler

"This list has been constructed over time based on a list and categories originally constructed by the late Professor Ted Michelfeld and owing debts to a number of other sources including The Encyclopedia of Science Fiction. It is still under construction and by no means complete but it is a starting place. The categories are by no means as distinct as is suggested here. Most every one of these works could appear in multiple categories and in many cases I have assigned them rather arbitrarily to one of the many choices they might occupy."

Definitions of Science Fiction

"These definitions of science fiction are for those of you who are not satisfied with Damon Knight's definition of science fiction, which appears in the rec.arts.sf.written FAQ: '...[Science Fiction] means what we point to when we say it.'"