Whether you use Microsoft PowerPoint or Apple Keynote to deliver presentations, there is plenty you can learn from the Apple presentation that kicked off this week’s Worldwide Developers Conference 2012 (WWDC). Several executives took to the stage to unveil new MacBooks, the new version of the OS X operating system (Mountain Lion), and iOS 6 for mobile devices. Each of the featured Apple speakers are skilled presenters, but the first 30 minutes of the keynote offers an MBA class in presentation skills. Here are eight techniques you can adopt to improve your very next presentation