Notable headlines:Mary Jo Foley: Microsoft: Free and open source software violates 235 Microsoft patents. Report: Microsoft says open source violates 235 patents. Fortune: Microsoft takes on the free world.AMD goes quad-core with Phenom.George Ou: Why VPN can't replace Wi-Fi security.Ryan Naraine: Hacker demos how to defeat Citibank’s virt ual keyboard.David Berlind: A video tour of Sun's Project Blackbox: a complete data center in a shipping container. Gallery (right).AppleInsider: Apple snags 10 percent of U.S. retail notebook sales in March.Robert Scoble: We need better statistics. Ryan Stewart: Metrics and the evolving web.CodeGear goes Ruby on Rails route.Microsoft unveils Web phone hardware.'Halo 3' gets mixed reviews at sneak peek. Java goes back to the PC. Gallery (right).Russell Shaw: I'm "Twittering" on my BlackBerry right now-but Not via SMS. My Chemical Romance fans: YouTube wants you to sign up with AT&T.VoIP's "four obstacles" are listed and described.Computerworld: DHS privacy committee joins Real ID opposition.Larry Dignan: PC buyers finally start seeing memory price breaks. George Ou: 2 GB DDR2-800 RAM drops to $90!New MySpace copyright tech turns heads, raises brows. Donna Bogatin: MySpace polices video copyright: Where is Google YouTube?Mary Jo Foley: Microsoft tees up LiveDrive hosted-storage service.Joe McKendrick: Group sets SOA success goal at 75% of companies - why is that important?Phil Wainewright: Appirio's eat-your-own-dogfood SaaS integration.Roland Piquepaille: A new weapon against tsunamis.Photos: Engineering le ssons learned from Katrina (left).Garett Rogers: Google Earth 4.1 released.Apple, others draw legal threat over media players.Techies shunned as workers fix own IT problems.Roland Piquepaille: Using technology to enhance humans.