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W20i is basically a list of Web2.0 websites. You can find websites through their name, their tags or by the services they provide. In the site details you can see the services they provide like for example that they export data as RSS feeds or can export into the Blogger API. Notes are for the services if a particular site has non standard approach to that service. For example ziki.com plays better with RSS photolist from flickr.com that from zoto.com.