I created a minimalist polling tool which handles URLs dynamically. On which channels should I promote it? On reddit, it was highly appreciated (10k views, 700 polls created in hours), but that launch boom has now died down. So, how should I promote it and maintain interest? (If you are interested, it's chilledlime.com)
Well, do what you did here, and do it more. You need to place your link on places with high traffic. Also, use social media platforms to further grow your traffic.
I would contact businesses that needs polling by searching the net for the right kind of bus. Also post on business web forums with your link.
Maybe create a debatable/controversial topic and engage people on here and on other forums and encourage them to participate in your poll using your tool. You can engage your friends on facebook, twitter etc. on every polls you create. After concluding the results of the polls you can then give them the background of the tools you've used, its features etc.