Hmmm, that's an interesting question. Honestly, I think it's easier for me to tell you what doesn't draw me to a thread based upon where I am at in my own transition and life (which isn't far), and this might make me sound like a douchebag, but I usually ignore 99% of "T" or hormone threads. I ignore 90% of top surgery/transition threads. I have the Mtf board completely on ignore. I ignore some questions that get asked over and over again. I ignore the majority of coming out threads because the positive ones where it seems like the majority of people support them triggers me to no end. I also tend stay away from deep threads with long paragraphs because I simply can't understand a lot of it and it's deep for me.
Outside of the most popular general threads, the Christianity section, my blog, and the FtM thread at times, I don't post much so I just kind of ignore most threads. I also try to be careful in picking what I respond to now because of the broken keys on my laptop and it takes a lot out of my fingers to type now.