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Consider using punctuation in your URLs. The URL http://www.example.com/green-dress.html is much more useful to us than http://www.example.com/greendress.html. We recommend that you use hyphens (-) instead of underscores (_) in your URLs.
Use ... period, comma or plus sign
"If you're looking at an old site and thinking about ripping it apart merely to change the underscores to hyphens, then you have your priorities wrong."
Yeah, right, you expected Brett change the naming convention of quite a large site in mid-stream?No, but the example given was created after Google was created. Your comment of "So do most sites that were around before Google." gave the impression that the WebmasterWorld Adsense page was created before Google was around.
But it's still a bad example.
[...]It makes absolutely no sense.Which is why I have left my old ones as they are. My early pages are a mix of:
"I'd also agree, stay consistent."