Old SEO Debate Update
While I don’t trust Matt Cutts to tell the truth to all questions, or more specifically relevant powerful questions, I do think it’s fairly safe to assume he’ll be honest on the more inane ones. So while some may say Cutts’ comment regarding dashes vs. underscores was a few years old and therefore unreliable as relevant to the current state of SEO, he’s reiterated his answer to that question much more recently:
I would recommend
And as side notes:
Matt Cutt’s answers could be worth skimming every now and then – although you’ll notice that the more relevant, heavy-hitting, upvoted questions remain unanswered.
Google Moderator could prove to be an interesting tool for web developers, although it seems to need to mature a bit.