I set up this blog a few days ago (July, 2012) and noticed an unusual amount of incoming traffic given that I had nothing out of draft mode yet. It turns out that someone (WK Selph) had this blog registered before me and had a few popular posts. How to Build a Fast Limit Order Book was one of them.
I am not the author of that page. I don't know why that author deleted his old blog, but he did; however, the page has been saved and duplicated by the people responsible for the QuantCup. You may read the original text -- the text you were likely looking for -- at http://www.quantcup.org/home/howtohft_howtobuildafastlimitorderbook