Shopping sites like Shopping.com, Yahoo! Shopping, BizRate, and NextTag already dominate Google's organic search results and paid listings.
Ask.com just announced their contextual ad network.
Amazon.com just had a solid quarter, and is selling ads directly via ClickRiver.
Why are ads on Wikipedia unthinkable? Because Jimmy Wales is gathering authority and content, waiting for his search project to launch. Don't be surprised if the Wikipedia contains ads soon after Wikisaria's ad program launches.
How many ad networks will online marketers be willing to sign up for?
If you think the web is full of spam now, wait until you see what it looks like when all the large brands put ads in the content, and when shady publishers have a dozen different distributed ad networks to chose from.
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