[via Dave Winer] Perseus Development Corp has done a survey of blogs. It “randomly surveyed 3,634 blogs on eight leading blog-hosting services to develop a model of blog populations. Based on this research, Perseus estimates that 4.12 million blogs have been created on these services: Blog-City, BlogSpot, Diaryland, LiveJournal, Pitas, TypePad, Weblogger and Xanga…The most dramatic finding was that 66.0% of surveyed blogs had not been updated in two months, representing 2.72 million blogs that have been either permanently or temporarily abandoned.”