Brief, opinionated reviews of some major guides to writing. A huge collection of writing-related links, with brief annotations. A good collection of advice, including information on diagramming sentences, easily confused words, rules for spelling, punctuation, and so on. A very basic but thorough grammar, with exercises. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept.
Different relations link the synonym sets.
A collection of short original pieces on writing, especially screenplays. Focuses on plot, characters, that sort of thing. A well written collection of useful tips for technical writers. Bear in mind, though, that some guidelines apply only to technical writing. A free, biweekly newsletter for writers.