Yelp lets users gripe or glorify on the go, Firefox defends its open security policy, and XP (Home Edition) hits the end of the support road in today’s day-ender.

• Firefox rated most vulnerable web browser
  That’s according to security firm Secunia, noting 115 vulnerabilities in the browser in 2008. Maker Mozilla responds that publishes every flaw it knows about, while the others don’t. [NeoWin]
• Yelp’s New And Improved iPhone App Officially Hits The App Store
  Now eaters, drinkers, and dry-cleaning aficionados can rate and relfect on a business directly from their iPhones—in less than 140 characters. [TechCrunch]
• Say goodbye to free support for Windows XP
  Home Edition, that is, and Office 2003 also moves out of the free support phase. Security updates will still be released, though. [Download Squad]
• Apple near ready with release of Mac OS X 10.5.7 Juno
  Keep 443MB on your Mac free—an update with 108 bug fixes and code updates could arrive as early as tomorrow. Nothing majorly new, but there’s a supposed focus on syncing improvements for Mail, Address Book, and other default apps. [Apple Insider]
• Tasks Feature Spotted in Google Calendar
  That little task manager that showed up by itself, then disappeared? Now it’s been seen in Google Calendar, with its own calendar and view. [Google Blogoscoped]
• Ubuntu 9.04 RC Released
  Nothing but bug fixes left now for the Jaunty Jackalope. The early-adopters-of-early-adopters can grab their release candidate here. [OSNews]