So far, the Pebble smart watch has done little besides offer up watch faces for users to tinker with, but the apps are starting to come in, and today marks the much-anticipated debut of early marquee partner RunKeeper. RunKeeper was an early player in the smartphone-based activity tracker market, and continues to be an industry leader. It was a natural partnership for both Pebble and RunKeeper, and now consumers get to see what the two can do together.