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SEOtop10 - 9:05 am on Jan 26, 2005 (gmt 0)
However it is a great way to attach yourself to a popular blog and you can get some clickthrough traffic. However you should make a worthwhile post or the site owner may delete your comment.
A consortium of search engines has announced the rel="nofollow" attribute for trackback links. So the search engine benefit will be gone anytime now.