I had read Overcoming Bias, very sporadically, and without really keeping track of authors or reading things in sequence, for a couple years before I found LW through it around July or August 2009 (at which point I started reading it more systematically).

Earlier in 2009 I had read "The Singularity Is Near", which was my first interaction with transhumanism/singularitarianism, and I was an excited Kurzweilian for a bit, which probably primed me to be particularly interested when I found out that the most prolific blogger on these awesome blogs of victory was the cofounder of something called the Singularity Institute.