The best site to promote your website, webpage, blog and hubs is Traffup.net.
Traffup is the number one tool to bring free traffic on your webpages (including hubs) and a lot of people, including me, on hubpages are using traffup to promote their hubs.
You can give it a try. Its free to register on traffup. Plus you get free 100 points on signup at traffup, which you can use to promote your hubs.
You can also read my hub (following link) for other ways to promote your hubs: