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Exactly as Georged said.
I don't see any value in doing someone elses job, unless you're getting paid for it or it's a 404.
Far more can be achived by a focused effort to optimise and submit your own sites, as appropriate.
Getting an engine to refresh your competitive page set will quite often provide a boost of several positions. Not only will 404's be removed, pages that no longer match the current algorithm will be dropped or relocated.
Once all the pages have a date that is fairly close to each other, it becomes much easier to analyze pages and make adjustments. You also may be able to identify sites that might be cloaking.