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If you are after Page Rank - I suggest you focus more on relevant blog postings to "dofollow" blogs with high PR. Most directories (quality ones) uses "nofollow" - meaning no PR juice is transferred to your site.
Submitting to directories help in your SERP. Just be sure to submit to quality ones (those with higher PR's) and place your site in the most apt category for better results. Avoid those that require reciprocal links.
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