SEO Keyword Effectiveness – Hyphens vs Underscores
Question: Is it true using hyphens in between your keywords more effective than using underscores when naming a Web page? Example: Is search-engine.html more readable by search engines than for instance search_engine.html? Answer: For the answer, read Matt Cutts Blog: http://www.mattcutts.com/blog/dashes-vs-underscores/