Caffe Driad is a nice coffeshop on Franklin Street (before you get to downtown Franklin Street). The outdoor area is really what makes this place great. The coffee is good, and they also serve beer and wine, so it's a good place to go after dinner with friends.
The employees can be a little snobbish in my opinion. They tend to have that "too cool to work here" kind of attitude that can be a little aggrivating. Maybe I've just been on bad days, but I find myself wishing they'd leave the 'tude at home. Other than that, it's a great shop.