Gender Exclusive Language - Learn six strategies to avoid using gender-specific pronouns. - http://www.esc.edu/esconline/across_esc/writerscomplex.nsf/0/564e043922d70d98852569c3006d727e?OpenDocument
Gender Fair Language - Jenny Redfern discusses how to minimize sexist language while neither violating English grammar nor using gender-neutral pronouns. - http://www.rpi.edu/dept/llc/writecenter/web/genderfair.html
Some Notes on Gender-Neutral Language - Carolyn Jacobson, a Ph. D. candidate who studies Victorian English literature, provides this handout about the history of pronoun usage. - http://www.english.upenn.edu/~cjacobso/gender.html
The History and Status of Singular Their (with Examples) - A discussion of the traditional and established use of "they/their" as indefinite genderless pronouns by Jane Austen and other well-known authors. - http://www.crossmyt.com/hc/linghebr/austheir.html
Gender-Neutral Pronoun Frequently Asked Questions - A comprehensive discussion of gender-neutral/gender-free pronouns in English over the centuries, such as 'sie', 'hir', 'ey', 'zie', singular their, and many others. - http://aetherlumina.com/gnp/
Viewpoints from Involvement -- "Thon" - The history and usage of "thon" as a genderless pronoun derived from "that one" is described. - http://www.chiroweb.com/archives/10/17/19.html