Google Knol is where you can post articles to it.You can post any articles and any link to it.With Google Knol you can earn using these tricks.
Google Knol allows linking back to any link.So you can advertise your business here.
You can also set up Google adsense at google knol.You can just add adsense account at google knol and start displaying your adsense ads at knol.You can even make a new adsense account with knol.So if you need a new adsense,google knol is very much great and makes easy to approve google adsense.