Ireth
Myth Weaver
I was just referred to an interesting and potentially very useful website devoted to pointing out common things people get wrong in sci-fi/fantasy writing, and ho to make them right. Haven't gone through the whole thing yet, as there's a lot there, but I think it's worth a look.
Science in Sci-Fi, Fact in Fantasy - Dan Koboldt
Science in Sci-Fi, Fact in Fantasy - Dan Koboldt