Although video streaming from cell phones isn't new, Qik is handy for live streaming to the world. Setting up and streaming your live video takes only a couple of minutes, and you never know--maybe you'll capture breaking news.
Qik gives you several basic settings for privacy and titling, and you can share your precious moments on social networks too. The app is easy to use, and the big start/stop streaming button helps you get the job done quickly. Just make sure you're in a good reception area, or the video quality gets really jerky.
As an alternative, you might want to try the Ustream app, paired with the Ustream Viewer.