This article is interesting, but it's really old (2005). There has been discussion about it since then. Here is an article from 2007 on Matt's blog: http://www

This article is interesting, but it's really old (2005). There has been discussion about it since then. Here is an article from 2007 on Matt's blog: http://www.mattcutts.com/blog/whitehat-seo-tips-for-bloggers/ http://www.mattcutts.com/blog/whitehat-seo-tips-for-bloggers... It says, at that time, Google was looking into making underscores word separators. Later, in 2009, Matt mentioned in a Google Webmaster Help video that he'd still recommend dashes if you can, but don't worry about it if underscores are working for you. They might still get around to making underscores separators: http://www.youtube.com/watch?v=Q3SFVfDIS5k http://www.youtube.com/watch?v=Q3SFVfDIS5k As of 6/20/2011, Google still recommended using Dashes in URLs here: http://www.google.com/support/webmasters/bin/answer.py?answer=76329 http://www.google.com/support/webmasters/bin/answer.py?answe...