Drupal 6 SEO: Improve SEO and Page Rank by preventing Link Juice Drain
As anyone paying a close attention to their Page Rank and SEO will already know this, too many outbound links from your webpage can drain the "Link Juice" of your webpage andcan hamper the Page Rank and SEO value of your website. This is especially true when you are displaying hundreds of comments on the same page and each comment links to the user homepage (which may be offtopic).
