If most of your inbound links go directly to your front page, then moving the pages should only temporarily effect your position or Page Rank. Google will begin to recrawl the site and usually within 30-45 days of indexing the new page, the old Page Rank should be restored.
flood6 offers a very effective solution, as it allows the SE's to crawl the previously indexed pages and find their new location via the custom links on the 404 page.
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