My frustration, and an intense one at that, is the use of the word "woman" as an adjective, as in "woman driver" or "woman doctor." Not only is the term usually completely unnecessary, as in the news headline I just read, "US woman soldier unrepentant over Abu Ghraib," but the very interjection of this word as an adjective implies that the role in question is somehow tainted or diminished when filled by a female, especially since the equivalent usage, adjectival "man," almost never occurs.
The sex-specific adjectives are "male" and "female." If you have to specify a person's sex adjectivally--and usually you don't--use one of those words. "Woman" is bad enough as a noun, since it affirms gender roles, but "woman" as an adjective is unambiguously insulting.