According to this press release on a survey from Perseus Development Corp., it is estimated that of the 4.12 million blogs created an currently hosted (using Blog-City, BlogSpot, Diaryland, LiveJournal, Pitas, TypePad, Weblogger and Xanga), roughly two thirds have not been updated over the course of the past two months. From their survey: “Active blogs were updated on average every 14 days. Only 106,579 of the hosted blogs were updated on average at least once a week. Fewer than 50,000 were updated daily.”