I’ve been told that I should use a dash instead of an underscore in my URL. Please explain. Thanks, Adam.
Adam, this is an age old question and one probably best left to answer by the search engine developers. Matt Cutts (AKA GoogleGuy) describes, in hisblog, that Google(tm) prefers dashes. What isn’t discussed in his dialogue is the fact that keywords in URLs are not as highly valued as keywords in the page title, Meta data and page content. To be on the safe side of things use dashes to separate words in your URL.