After a rather slow start, sales of Blu-ray high-definition titles are accelerating and are likely to take off exponentially during the holiday season, according to a report by U.K.-based Futuresource. Blu-ray titles will account for about 12 percent of video sales by the end of the year, the research firm said, and will rise t 61 percent by 2012. In a statement Futuresource managing director Jim Bottoms said, "What has impressed me most is the way the retailers are supporting Blu-ray and how much space they are giving over to Blu-ray discs."