I've begun a Google Knol adventure. Gogole's new site, knol.com, has been touted as a rival to Wikipedia as well as article directories such as About.com and Associated Content. Since the site just launched to the public this summer, it really is brand new.
My first knol is about eHow Earnings and links to both an eHow article on passive income and my eHow eBook sales page. It's monetized both by the presence of these links, which lead to sources of income for me, as well as the Adsense ads displayed next to my knol.
I don't expect the knol to earn much, since knol is a new site and according to Google not receiving favortism by their search engines. I imagine eHow will be superior for earnings for some time, as the how-to site has been in existence since 1999 and is highly ranked by search engines. Knol will take time to build up the kind of traffic eHow gets on a daily basis.
Earnings aside, Knol looks like a great place to author content, articles, essays and reviews, and build a presence as a niche authority or a freelance writer.
I wrote a concise guide to Google Knol and earning money with the site; I plan to expand it as I learn more through my writing results with Knol.