Google Glass isn't quite out in the wild yet, but if you were holding out based on your phone's operating system, now's your chance -- MyGlass just hit the iOS app store.
The free app will let Glass users configure their new face-computers, beam navigation prompts from phone to face, and screencast Glass's view onto an iPhone or iPad. Of course, the app is completely useless if you haven't got Glass; Google even says so in the description. But don't let that stop you from downloading it and pretending you're a Glass Explorer.
Update: Google seems to have pulled the iOS app. [MyGlass on the App Store]