on hubpages it's only through the ad program and ebay if you dont use those two.
If you have other blogs/sites, there are tons of other ways to monetize it like clickbank, CJ, and a lot of other ones.
Alternatives to adsense are kontrera and info links.
You could also write your own ebook/create your own guide to something and sell that.
So that's three main ways (at least the ones I use):
affiliate marketing (amazon, clickbank, ebay, etc...)
ad programs (adsense, infolinks, etc...)
info product creation and sale.
The other stuff I know off but have never tried are:
membership sites and ecommerce