rajvnandy is correct about other search engines, but there are other ways of directing traffic to hubs. Any website that has a lot of people viewing it is a possibility if they allow you to post links back to your hubs. That's called back linking. Some popular sites that allow back linking are Snipsly, ShetoldMe, RedGage, etc.
Do a search on HubPages for hubs about back linking. I'm sure you'll find lots of hubs written about it.