Re: [drupal-devel] [feature] Implement google's rel="nofollow"

Google dictates and the people follow ;). Personally I don't think implementing it will stop comment spam much as there will always be blogs and guestbooks that will not have this feature. Experience has shown that making a medium less effective for spam simply causes spammers to spam harder. It's only when the medium becomes 100% ineffective, that they stop.

I mostly agree. Yet this should help keep PageRank and similar relevancy algorithms from being manipulated easily. I rely on search engines every day (and so do all of you, I suspect). We all should want to keep search results as relevant as possible.