I got a request to post a link to this page - and I'm doing it, because it's a good resource.
33 terms every grammar geek should know contains brief definitions of a number (33 in fact) of technical terms to use when talking about grammar (and syntax, and rhetoric, actually). I like the simplicity of the definitions, and the grasp of what things are instead of 'ought to be'. This is no peever's page.
For instance: The passive voice combines a "to be" verb and a past participle to emphasize the more important components of a sentence. Goodness me! For a single sentence, this is excellent - and manages to let you know that the passive has uses beyond being (as the Loggers say) "vague about agency."
So check it out.