This entry was published at least two years ago (originally posted on September 23, 2002). Since that time the information may have become outdated or my beliefs may have changed (in general, assume a more open and liberal current viewpoint). A fuller disclaimer is available.
Phil makes a good case for not including TrackBack metadata in the HTML for the main site page. This works well for me, as I’d previously struggled with it causing problems with the HTML validation for my site. So, TrackBack data is now only present in individual entry archives, and the main page is back to clean, validator-friendly XHTML.