Hyphens or Underscores? Which is Best?

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Another age old SEO / webmaster question ... should I use hyphens (dashes) or underscores in my page names eg. my-page vs. my_page.

Matt Cutts from Google states that it does make a difference as hyphens (dashes) are treated as seperators whereas underscores are not.

However he also says not to worry too much if your site is currently doing well, certainly don't go changing all your pages just because of this post. If it ain't broke, don't fix it!

But sure, if you're designing a brand new site structure, stick with hyphens - they look better and are easier (IMO) for people to remember and type (and they help Google to recognise seperate words).

A disclaimer: Like everything with SEO - just because this is currently the case doesn't mean it'll stay like this forever ... in fact this video was originally posted in February 2009 ... so they may have included underscores as seperators now too .... but I'd still stick with hyphens.