Techcrunch, the tech news site put out by Michael Arrington, gets a cease and desist from Youtube. So what: Youtube sends out copyright infringement notices like spammers send out viagra offers. This legal threat is slightly more interesting. The offense, says Arrington, was the promotion of a small tool to allow downloads from Youtube. In its cease-and-desist letter to Arrington, Youtube, now a which will be viable only if it can display its ads alongside video, claims unfair business practice and tortious interference. Did Arrington pay the Youtube robolawyer to write that? A fight with Youtube, a day after it's formally acquired by Google, the logal megacorp: what a gift.