301 – Permanent move of the content: For site launches to direct users to new urls of the new site structure.
302 – Temporary move of content: Say a product is out of inventory, page removed for a while. Use this to direct users to a different similar page.
404 – Content removed: Google looks at these as broken, though they’re just pages that don’t extist. Particularly problematic on incoming links. All other codes are better than this one for non-existent pages.
410 – Content Permanently removed. Better than a 404 for missing content.
Some info
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
http://www.seomoz.org/blog/how-should-you-handle-expired-content
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