One of my favorite things about Providence is that we have one of the highest number of coffee shops per capita in the country. At last count, that's about 23 coffee shops per 100,000 people, which makes it the perfect place to celebrate National Coffee Day on Sept. 29. But with a cafe on just about every corner, how do you decide where to go? I did a very informal survey of my GoProvidence coworkers to find out their favorite caffeine source. Here's what they had to say.