First post! 
I've been on a MASSIVE Trek reading binge this year, and it all started with watching Rod Roddenberry's Trek Nation.
I'm in my late 30s but been a fan of the franchise since I was around 4 or 5 years old. I've read some of the actor biographies when I was in my teens, but Trek Nation inspired me to read up on Gene Roddenberry and all the behind the scenes stuff, which I never got THAT into.
Since January, I've devoured:
The 3 main Roddenberry biographies (by David Alexander, Joel Engel, and Yvonne Fern)
Susan Sackett's book about her relationship with Gene (I actually felt quite sad for her)
The Making of Star Trek
The Making of Star Trek: The Motion Picture (enjoyed this, but it does seem a bit fluffy. Would've liked to have read more about the drama that took place that was alluded to in Shatner's Movie Memories)
Inside Star Trek by Solow and Justman (fantastic)
Chekov's Enteprise (what an interesting book!)
The Longest Trek by Grace Lee Whitney.
I'm currently reading "I Am Not Spock", with Nicholas Meyer's book lined up after that.
I'm going crazy because I really have nobody in my personal life to talk to about Star Trek with in an in-depth, geeked out way.
So hopefully you guys have something to say about these books.

I've been on a MASSIVE Trek reading binge this year, and it all started with watching Rod Roddenberry's Trek Nation.
I'm in my late 30s but been a fan of the franchise since I was around 4 or 5 years old. I've read some of the actor biographies when I was in my teens, but Trek Nation inspired me to read up on Gene Roddenberry and all the behind the scenes stuff, which I never got THAT into.
Since January, I've devoured:
The 3 main Roddenberry biographies (by David Alexander, Joel Engel, and Yvonne Fern)
Susan Sackett's book about her relationship with Gene (I actually felt quite sad for her)
The Making of Star Trek
The Making of Star Trek: The Motion Picture (enjoyed this, but it does seem a bit fluffy. Would've liked to have read more about the drama that took place that was alluded to in Shatner's Movie Memories)
Inside Star Trek by Solow and Justman (fantastic)
Chekov's Enteprise (what an interesting book!)
The Longest Trek by Grace Lee Whitney.
I'm currently reading "I Am Not Spock", with Nicholas Meyer's book lined up after that.
I'm going crazy because I really have nobody in my personal life to talk to about Star Trek with in an in-depth, geeked out way.
So hopefully you guys have something to say about these books.