Web CMSen like Drupal and PHPnuke (which is, I'm guessing, what O'Reilly's OSDir.com uses) should support creating accounts by giving the URL of a FOAF document. Drupal already supports cross-site registration (notice this Drupal.org blog item posted by jibbajabba\@iaslash.org), but FOAF appears to be a format for this type of general personal data that's gaining acceptance amongst the geek sort.
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wat is foaf is it anylike friendster?!??