Knocking app was the first app store app that let you stream video from one iPhone to another and was said to have been approved directly by Steve Jobs himself. The first version was unstable but with the latest release, everything seams to be working as advertised. You can even view your friends iPhone video with your iPod Touch or earlier iPhones!

This app serves as a viewer for all Ustream.com videos including videos streamed from your iPhone via the Ustream Live Broadcaster app. You can view live and previously recorded videos as well as chat about the video feed while watching!

Watch live shows and chat with thousands of viewers on stickam.com. You can view the feature list of shows, search for live users, and view the video in portrait or landscape mode.