Hi JK,
I am in the same situation as you are. I am training for the New York City Marathon in November. As Doug stated, StayFit is a terrific way to continue on running with a group. I did that for a couple of years.
As a suggestion, I would be happy to join you on the weekends preceeding the NYC Marathon. I plan to run the Portland marathon as my last long run at a much slower pace. Then, I will taper from there until NYC.
There are other folks also running NYC and other marathons later in the Fall. Maybe we can get a group going...
Take care,
AC Clemisom
(Think Green)