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@Kevin if you look at my example, i'm not using an opaque string or an integer but simply the domain without the first level. Name and site_url are ugly keywords. Imho you are not carefully thinking how these keys will be used, expecially on web applications. Have a look at Farseeker post, you are suggesting him to adopt a solution like "column80.com/?site=Q&A for professional and enthusiast programmers !"
@Kevin I don't like it and i don't think that something like stackoverflow.com can be key-friendly, url-friendly or seo-friendly. Please keep in mind that there are apps using these "keys" as parameter on Urls (like mine or column 80).