Got green tech? You could get some free online advertising

This is a pretty clever way to build a list of prospects that happen to specialize in green tech. Jivox, which is an online video advertising service, is running what it's calling the Free4Green sweepstakes. Winning companies, which will be selected on a monthly basis, will be entitled to 100,000 video ad impressions on the Jivox Publisher Network.

Here are the eligibility requirements: - Entrants must sell some sort of "green" product, be developing a green technology or implementing an eco-friendly corporate policy. - Companies have to submit a description of why their policy, project or product is environmentally green.

There will be one winner chosen each month. Here's the link for entering.