Scott Forstall, head of Apple's mobile software division, is a "mini-Steve," Apple insiders say -- a hard-bitten, hard-driving boss with an obsessive eye for detail and an occasionally abrasive management style. "I once referred to Scott as Apple's chief a--hole," says former Apple software engineer Mike Lee. "And I didn't mean it as a criticism. I meant it as a compliment. You could say the same thing about Steve Jobs."