I've read several articles around the web about clean URL structure and how they aid site usability, but I still can't decide on what separator I should be using. Currently I am using _ to separate words in my URL's, but most seem to be using - as the separator. I would appreciate feedback on the pros and cons of the following URL structures;
It has been the dash for a long time. There is some recent news that Matt Cutts says Google is now treating dash and underscore the same. SEO's are a superstitious bunch and we will probably stick with dashes until our last breath.