Sexed Texts offers an excellent introduction to the field for those interested in understanding the construction of gender and sexualities through language and the complicated ways in which dominant discourses emerge in our textual worlds.
Gender & Language, 7.2, 2013
For although I may not think this is the perfect teaching text (which I expect to be published at the exact moment hell freezes over), its strength is that it does show what can be done with textual analysis, and provides models for doing it systematically. For certain kinds of courses that is exactly what teachers want; if you teach that kind of course then you should certainly order a copy.
Journal of Sociolinguistics 13/4, 2009