Moms In Motion Running Team
This organization, Moms In Motion, facilitates the creation of teams nation-wide of Moms for a variety of sports. The idea is to focus on an event and support a charity and work together towards your goals. Here in San Diego, the first teams are running teams in Mission Bay area - check them out:
http://momsinmotion.com/locations_team.asp?a=vt&t=223&l=64&c=3
I have no personal experience with this group, but I know my own running club helped a lot when I ran my first marathon and I believe having support and the fun of a group can be a huge asset to achieving your goals.

