http://www.youtube.com/watch?v=NuTcjbMfWRM
This is a picture from a video intro I created for a friend's marketing agency to enable him to use this for Youtube online videos. The video was entirely done in Blender (except for the audio in post-production). I used animated lights for the effects and the stream is a vector blurred circle - although I think an actually animated mesh with a lattice modifyer would have given a lot more control. The blur was hard to control and took a lot of experimentation to get it right in speed, offset, etc. The link to the video is referenced above.
