While the blog hasn't been updated in a while, the archives are full of resources and insights about creating and negotiating happy relationships as queer, transgender, polyamorous, and kinky. There is also much discussion about how to deal with abuse in our communities (the missing stair), and how to avoid being a shitty person in general. Looking for a laugh? I recommend checking out the cosmocking tag.
Cliff also has an active personal tumblr where he occasionally answers questions pertaining to sexual health, kink, etc.
A queer-inclusive, sex-positive website aimed at teens, but helpful for all people thinking about having sex. It has reliable information about both the medical and emotional aspects of sexual relationships. A truly valuable resource for all ages.