Screencasts: The Screening Room #4 is now live. This month’s topic is Sun’s grid compute utility. The first part walks through buying CPU hours, uploading jobs and running them on Sun’s grid. “When you see how quickly a distributed job can burn through CPU hours, you start to get a feeling for how this might make business sense,” Udell explains. Quoteworthy: “Linux? Oh, of course, I guess we had forgotten that’s open source.” — An IT professional, as told to Matt Asay. Linux has arrived, open source is arriving.Security: Roger Grimes looks at Microsoft’s password checker and determines that, although it suffers from weak algorithms, it can get many users on the right track. Columnists’ corner: The IT director of a small document management company recounts what happened when his shop was slapped with a fraudulent patent infringement suit — after the would-be-plaintiff had tried to partner with his company. “Most patent infringement lawsuits are a form of financial warfare in which right and wrong have very little importance,” writes our Off the Record author, in The extortion game. Technology Industry