A quote from Matt Cutts (Google) blog today
Worth bearing in mind when you add new pages. If you decide to rush out and rename your pages - do a few at a time and make sure you create a redirect from the old name to the new for each change.
And speaking of putting a dash in URLs, hyphens are often better than underscores [Ed. Note: bolded by Matt ]. african-elephants.html is seen as two words: “African” and “elephants”. african_elephants is seen as one word: african_elephant. It’s doubtful many people will be searching for that.
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