CoveritLive's web based software publishes your commentary in real time like an instant message. One-click publishing lets you add polls, videos, pictures and audio clips instantly, and take questions.
SceneMaker lets you to select a portion of a video off of YouTube, etc and share just that portion of the video without having to show the entire original video.
TubeTV is a freeware program for Mac OS X which enables you to search for, save, and convert YouTube and other flash videos to a format suitable for playback on your favorite devices.