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A complete SEO strategy has two fundamental parts. On-page optimization, and link building. These processes support and reinforce each other - neither one will work by itself!

If you optimize all your pages, but don't build links back to your site, the search engines will have no problem indexing all your content but you will lack authority in the rankings.

If you establish lots of backlinks, but neglect key steps in configuring and composing your content, the search engines won't recognize you as relevant to your target keywords.

The AJAX translation script that I made available last time has now been officially released as a Drupal module called Translatable Comments. It is compatible with 5.x and 6.x versions of Drupal core.