I am often asked by those getting started in video what my recommendation is for a lighting kit. While I do point them in the right direction as far as some great inexpensive setups, the main thing I emphasize is that it is not the lights that matter--it is the knowledge of how to use them. A great DP can often get an awesome-looking setup using nothing but existing light and a reflector or two. At the same time, I have seen people with $10,000 worth of lighting turn out inferior work.
This DVD from Vortex Media will show you how use a relatively inexpensive kit to its full potential on single-subject interviews, the most common type of shot for almost every videographer.