As research for this book, I read: 1) every on-line chat that J. K. Rowling has ever done; 2) more than 250 news articles mentioning the quoted phrase "Half-Blood Prince" in a leading news warehouse and more than 320 articles identified by Google News as mentioning the quoted phrase "Half-Blood Prince"; 3) 377 blogs mentioning the quoted phrase "Half-Blood Prince" in the blog search engine Feedster; 4) More than 1000 articles posted on Usenet newsgroup alt.fan.harry-potter; 5) hundreds of posts on dozens of Potter-related websites; 6) dozens of trademark applications at the UK and US patent offices; 7) numerous biographies and critical works about J. K. Rowling; 8) and, of course, the entire series to date!