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Drupal SEO Spotlight: Hyphens or Dashes?
There's some controversy in the Drupal community over which characters to use to break up your site's paths. Most sites use either dashes or underscores. Personally, I prefer underscores for readability reasons. To me, it's easier to mentally parse this url:
http://www.davetech.com/drupal_consulting_services
Than this url:
http://www.davetech.com/drupal-consulting-services
SEO Implications
Improve your PageRank: Basic SEO with Drupal
There are lots of articles out there about how to make your site more SEO-friendly, but few of these address Drupal sites specifically. Fortunately, there are a number of easy changes you can make to your existing Drupal site more appealing to search engines! Follow these six simple steps and you should see an increased number of visitors, using the same content you currently have published.