Ok, I've been thinking about a book for a while. I want to get down some of the topics I want to talk about. This list will be a work in progress. Feel free to comment and add topics to the list.
Gender Identity
Gender as a social construct
Separating gender and sex
The three levels of identity - Ascribed, Disclosed, and Self
Gender Policing
The case against "Deep Stealth"
Family
Religion / Spirituality
Voice
Relationships: both romantic and platonic
Gender paint theory
Gender binary vs Gender spectrum vs Gender Continuum
Eonism (i.e. the movement that looks at gender binary as a detriment to all human beings)
A look at the evolution of gender throughout history
Employment
"Passing"
Hair and the removal thereof
the Transgender Age gap (i.e. those that transition at age 20 vs age 40 or 50)
Choice (i.e. does one choose their gender identity)
Sexuality and transgender
Sex organs and the taboo of genital modification
Surgery
Competition
Body image and transgender
The prevalence of nerds in the trans community
"Post-Transsexual" as an unhealthy identity / Transsexual shame
OK...that's all I can think of for now. More as thoughts develop.