"Meme" trackers like Memorandum and Topix.net show you what's currently hot in both mainstream news and in the blogosphere. They're great services to help you keep up with both breaking news and trends.
Richard MacManus has put together an excellent summary of the current generation of these meme trackers, specifically looking at how they handle technology news and postings, and concludes:
All in all, Memeorandum still comes out trumps in terms of clustering layout, speed and relevancy. Topix.net and TailRank are strong services too. Also I suspect Chuquet and Megite will pick up the pace once they've enhanced their interfaces.
Read on for more in Rating the Meme Trackers.