On the sidebar of the homepage, there is a running list of the currently most popular posts on the blog, but as follows are five posts I'd recommend to folks who don't have time to look through everything. There is also a full blog archive and a search tool on the homepage if you can't find what you're looking for.
Introduction: Transgender without Transition
Gender and Sex 101: There's No Such Thing as Male and Female
10 Simple Things Cis-Gender/Straight Folks Can Do to Fight Transphobia and Homophobia
Busting 5 Myths About Co-ed and Trans-Friendly Bathrooms
"I'm Not Racist, But": Colorblindness, Privilege, and Humor (or lack thereof)