NEVER use your camera's built-in microphone for interviews..green screen with voice..training material..news reports...customer testimonials...Web Blogs...Corporate Communications
Even iPhone users can do better then the default recording mic.
For Run and Gun Interview material...get this Sennheiser ME66 Shotgun Microphone, and a good wind screen.
"After a successful trial period BBC news cameramen/editors will be upgrading to Final Cut Pro X from FCP 7 for their news gathering field operations. A full roll-out throughout all the English regions is expected next year"