Link rot in the blogsphere

Link rot used to be associated with Web 1.0 and the dot com bubble. But as I resume daily blogging based on the research I conducted from 2002-2008 for a book project I abandoned, it's clear that the blogosphere has its own link rot, and it may be a more pronounced case. Vast amounts of useful stuff has disappeared already, and the trend may be accelerating during the latest economic downturn.