Michael Mann, the professor who created the climate-change "hockey stick", announced over the weekend his intention to sue National Review over Mark's Corner post "Football and Hockey".
You can see the letter from Professor Mann's lawyer here.
You can see various reactions here, here, here, here and here.
UPDATE: Rand Simberg responds here, as do Discover Magazine, David Appell, Instapundit, the author of The Hockey Stick Illusion, the Lesbian Conservative, the Pundette, and the excitable lads at Daily Kos. Kathy Shaidle is looking forward to it.