Murky Coffee here in Arlington, Virginia, has great coffee and is a relaxing place to work on your laptop with free WiFi.
They were recently a small internet sensation when an angry cusomer was denied espresso over ice. The customer blogged about it. Boing Boing and the Washington Post picked up on the funny story and Murky Coffee has responded on their site here and then here. It seems that the customer considered espresso over ice to be a god-given right in a coffee shop. Whatever the case, they make good coffee and are worth visiting.