I don't create too many backlinks for the Hubs I write. But when I do, here's where I link:
within Hubpages -- I always try to link together my Hubs that have a similar topic
RedGage -- sometimes I'll post my Hubs there
Ezine articles -- I wrote one article and linked to a Hub. I'm going to do more.
Facebook and Twitter ... I'll Tweet and put up on Facebook.
Topical blogs -- I'll find topical blogs and use the Hub's url when I comment.