Make your hubs attractive and easy to read, with lots of subheadings and breaks.
Post your hub links to Twitter, Facebook, Digg, and other social networking sites.
If you have interesting images in a hub, consider adding them to your Pinterest feed, as they will link back to your hub.
Make sure you're using the "Groups" labels to interlink similar hubs within HubPages.
Make sure you're using key words that search engines will pick up (SEO, search engine optimization.)
Link back to your hubs as often as possible.