My understanding of Google nofollow policy and "invitation" is:
Quote:
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GOOGLE: We hope the web software community will quickly adopt this attribute and we're pleased that a number of blog software makers have already signed on
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Google isn't asking let alone demanding that you to do anything with the nofollow attribute. They are simply making a facility available for any site operator to use. In the case of a Blog or Forum, this would be mutrually beneficial.
For the Blog or Forum owner, this type of unhelpful and spammy link posting would all but die out, providing the policy to impliment nofollw to ALL posted links is clearly stated. Thus making the Blog or Forum a nicer place to visit.
As for Google, it would remove a huge slice of Spammy links that they have decided (correctly IMHO) dilutes the quality of their search results.
Don't forget that as a Blog opperator that relies on posted links, there is no requirement for you to dry up this section of visitors. You only impliment nofollow if it suits your purpose and policy.
For an ordinary site, the nofollow attribute allows spiders to be asked not to follow links to pages that you would rather weren't indexed but needed to link to.
For example contact.htm (why make it easy for SpamBots)
IMO this is a genuine attempt by Google to make the web a better place less spammy links, certain pages not indexed (if required) and of course better quality SERPs