What Do You Think is another free site to join, once again only dealing with surveys, and the bummer is that you have to be invited to join one. The way it works is simple you have an advertising ID for each affiliate and Hubpages have their Affiliate ID too, for every 100 readers of your hub your Advertising ID will be on the ads 60 times and The Hubpages ID will be on the ads 40 times if an ad is clicked when your ID is on the page you will recieve the money for it and if Hubpages ID is on the page when an ad is clicked they will get the money.
Google Adsense is for most Hubpages Authors the best way to make money from advertising on the site, the more page views that your article recieves the more chance that one of those viewers will click on the ads on that page.
There are millions of people out there who claim to be experts on Google Adsense offering advice and opinions on how to get more money from the clicks on your ads, what works best for me though is to go straight to the source, Google Adsense gives a lot of useful advice and tips on how best to use their services they even provide a service on which are the best keywords to use for the article that you write.
The best way by far to make money from Ebay and Amazon is to target a product that they both sell and write an article about that product, once you have written your article you should visit both Ebay and Amazon and choose products that compliment your article to add to the relevant capsule.
Kontera like Google is a pay per click Advertiser, you get paid a commisssion when someone clicks on on of the ads in your Article, they payout though is a good deal less that Google but it is still a good source to make a few extra dollars every month.