While in the chat a few days ago, someone recommended Raymond Franz's Crisis of Conscience.
Another excellent book pertinent to the JWs is Lois Lowry's The Giver. Yes, it is a young adult book, and yes, it's not about witnesses per se. However, many of the themes in the book are strikingly parallel to stuff that goes on in the everyday life of a dub.
For example, in the community in the book, people are killed after they break the rules three times, which the community calls "a release." I think this is similar to how the JWs disfellowship those who don't conform to their strict standards.
Next, you can't even choose your own marriage mate. You are assigned a partner. In the "truth," I noticed you aren't supposed to date those who aren't baptized JWs. This hurt me in particular, because I was a study and I fell for a girl who is a pioneer. She's an elder's daughter in fact, but alas, she's way out of my reach.
Also, there is a body of elders and a man called who is the giver, hence the book's namesake. Both the elders and the giver understand the real truth, but they keep that information from the community.
JWs are often accused of being little more than clones, and this is certainly the case in The Giver. Everybody looks alike. Everybody is issued the same stuff. They go so far as to remove people's ability to distinguish color. In other words, there is no color.
Finally, you don't get to choose your career in the story. After children reach a certain age, they are assigned a job based on characterstics they have shown while growing up. The JWs discourage higher education, jobs that are in any way, shape or form related to Christendom, - Salvation Army, etc. - thus severly limiting the dubs' career choices.
And this analysis doesn't even do the book justice. The parallels are there, although in the book, they are much more severe than in the borg. However, it wouldn't surprise me to see the JWs inch toward a community much like the one in the story in the near future. Please don't dismiss this story as a children's book either, because when I took a class on young adult literature, I found more often than not, the stories contained very serious, adult themes.