If you're looking for running partners, the Pacers groups are really fun. They meet on Tues and Thurs evenings at 7 out of multiple locations, as well as some mornings. See http://runpacers.com/funruns/ for details. Participation is free, and frequently there will be gear reps there and we can test out gear on the run, enjoy snacks afterward, etc. Sometimes there's a sports doctor there to provide free injury screenings.
I've met a few other DC Tri Club members there already, but figured others might be interested. The runs are 3-5 miles, multiple paces. Hope to see you there!