J.P. Lick's Davis Square location is great for their late hours and consistently friendly staff, in addition to the awesome ice cream flavors they serve. All the standards, plus a few with more flare, are available here. There is a good selection of sorbets and frozen yogurts, and the frappes are good too. The coffee oreo ice cream here remains my favorite ice cream of all time. And the store earns a few bonus points for having a cone stand so that you don't have to maneuver the treat you just ordered while you're trying to pay for it.
more