SEO Tip #17: Should I use underscores or hyphens in URLs?
Matt Cutts: It does make a difference. I would go with dashes or hyphens if you can. If you have underscores and things are working fine for you I wouldn’t worry about changing your architecture.
A while ago I said we were looking at underscores as separators and the reason we typically never talk about stuff in the future is that gives us the freedom to change our mind. In fact
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