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Once a URL goes live plan to maintain it forever
Yes it may sound crazy but once a URL goes live you must maintain it… forever! (if SEO is your thing that is). Now that isn’t to say that you shouldn’t change or remove some URL’s, just make sure you create an Apache rewrite rule utilizing a 301 redirect. I deal with this on a monthly basis at work and its not so bad as long as you track your URL movements. Rewrites are an SEO’s best friend. Here is a good way to check to see if a Google has any records of a given string in your URLs:
http://www.google.com/search?q=site:johnclarkemills.com+inurl:seo
http://www.google.com/search?q=site:johnclarkemills.com+inurl:2002