Blogdex
Blogdex.net was an online resource for understanding hot topics of discussion in the blogosphere.
The site, which went offline in late October 2005, offered a time-weighted list of links to online content that was cited by more than one monitored blog in the recent past. Each link received a score based both on the number of different blogs citing it and recency of those citings; the list thus typically featured both popular odditites of the day as well as informative and/or controversial source material for current topics of public debate.
Originally located at blogdex.media.mit.edu, the inventor of the site requested and received the blogdex.net domain name from Wikipedia, which owned it at the time.
Blogdex was created to facilitate the research of a Ph.D. student at MIT. It is not clear whether the site will be revived.