This is what developers use to show applications to an audience: http://www.techrepublic.com/blog/software-engineer/project-your-android-phones-screen-onto-a-larger-display/
A hardware phone screen projector like Paraben's Project-A-Phone ICD-5200. Expensive.
Eclipse and the Android SDK, and then run your application in the Android emulator. Slow.
A free application called Droid@Screen.
